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26. Proceeding from left to right across the Periodic Table; which of these statements is true? The atomic size of the elements increases b. The electronegativity o...

Question

26. Proceeding from left to right across the Periodic Table; which of these statements is true? The atomic size of the elements increases b. The electronegativity of the elements decreases c The valence electrons of the elements are held more weakly d. The ionization energy of the elements increases27. TIn Bohr'$ atomic theory, energy is absorbed when an electron jumps from one principal energy level t0 higher principal energy level.28. TThe and p orbitals are completely filled in the famil

26. Proceeding from left to right across the Periodic Table; which of these statements is true? The atomic size of the elements increases b. The electronegativity of the elements decreases c The valence electrons of the elements are held more weakly d. The ionization energy of the elements increases 27. T In Bohr'$ atomic theory, energy is absorbed when an electron jumps from one principal energy level t0 higher principal energy level. 28. T The and p orbitals are completely filled in the family of elements known as halogens 29. Which of the following elements has the largest number of unpaired electrons? a.F b S Cu d.N 30. Which one of the following elements has & 6s*40'*5d' valence shell electron configuration? a. Se b. Mn Mo d. Tc Re 31,. The Pauli exclusion principle states that electrons must spin b. all electrons occupy spherical orbitals call even number electron systems must pair their electrons d. we can never know the position of an electron exactly no two electrons in any system can have the same quantum numbers 32. Place the following elements; Sc; As; Br; Vand K in order of increasing size a.KSc<V<As<Br b. Se<V<KAs<Br cKAs<Br<Sc<V d. Br<As<V<Sc<K V<Sc<Br<As<K 43. How many partially filled orbitals are in a Vanadium atom? a. 0 b. c. 2 d.3 44. How many unpaired electrons are in the V+2 ion? a. 0 c.2 d.3 45. Identify the following orbital: n = 3,8=1,mb=+1. a. 3d, b. 3s 2px d. 3px 3pz



Answers

Determine whether each statement that follows is true or false: a) Electron energies are quantized in excited states but not in the ground state. b) Line spectra of the elements are experimental evidence of the quantization of electron energies. c) Energy is released as an electron passes from ground state to an excited state. d) The energy of an electron may be between two quantized energy levels. e) The Bohr model explanation of line spectra is still thought to be correct. f) The quantum mechanical model of the atom describes orbits in which electrons travel around the nucleus. g) Orbitals are regions in which there is a high probability of finding an electron. h) All energy sublevels have the same number of orbitals. i) The $3 p$ orbitals of an atom are larger than its $2 p$ orbitals but smaller than its $4 p$ orbitals. j) At a given sublevel, the maximum number of $d$ electrons is 5 k) The halogens are found in Group $7 \mathrm{A} / 17$ of the periodic table. I) The dot structure of the alkaline earths is $\mathrm{X} \cdot$, where $\mathrm{X}$ is the symbol of any element in the family. m) Stable ions formed by alkaline earth metals are isoelectronic with noble gas atoms. n) Atomic numbers 23 and 45 both belong to transition elements. o) Atomic numbers $52,35,$ and 18 are arranged in order of increasing atomic size. p) Atomic numbers $7,16,$ and 35 are all nonmetals.

So we were looking at chemistry on trends to be specific. So this links into our period a city which is also covered in this podcast series, where we're looking at how elements are placed on the periodic table to reveal their period of city to us and the trends and the properties that they possess, which allows us to determine how exactly these elements might work in chemical reactions. So the smallest atomic radius in the Group 16 is oxygen. The largest atomic radius in the sixth period is freedom. Oh, a moving on to the sad point. We're looking for the metal with the smallest atomic radius in Assad period. That has the element at the left hand side. So this is aluminum. The the highest organization energy and Group 14 that is carbon lowest in the first period has the element at the left side off the period that is all seen on so the most metallic element in the 15th period that is bismuth the I. So next we have the highest energy level field in the fourth period, which is crypt on element with dick following configuration and E three asked to three piece two is silicon element with the configuration KR 5 to 46 is Are you? I went with the configuration. Ir three d three is titanium element in the first period with the pseudo noble gas configuration with plus three is cadmium element in the fourth period that forms three bliss. Die magnetic ion be element in the fourth period that forms a two plus iron with half filled the orbital is manganese on n heaviest land Tonight is why be element in the third period. That's like I saw electronics with a are one in the tu minus is so for that air alkaline as metal where the Catalan is isil Electronic with K R is strong tea. Um lastly the matter Lloyd from group five A with the most acidic oxide is arsenic.

Hey, guys leads to problems want to do in this problem? Some in statements are given. We need to answer if this is true or false, the first statement say's energies contest, meaning that on the certain energy the loser allowed, we know that electrons occupy orbital's off. Sergeant fixed energy, electrons occupy or victims off fixed energy and the fractional val off orbit. Ince's not possible. Therefore, this is a true statement that energy is contrast Then, the second one says, both discovered that energy, often electron in an atom is contest. Since electron does not move freely around this space, which around the nucleus the electrons move in a fixed your wittle and this origins are having fixed energy, so electrons move in fixed or retail's off. Sergeant energy. Therefore, the energy of the electrons in an atom is contest, and this one is a truly statement. Then the third statement sees electrons in atoms are confined to regions office space called principal energy level. Now there is a larger space outside the nucleus, but the electrons are confined to specific regions, so electrons are confined to specific region, and they do not really move around the nucleus and this specific regions. These are called principal energy level. Therefore, this is also true statement mhm then di Saiz. Each principal energy level can hold a maximum off two electrons. We know that each principal energy levels they have different subsections and the subsections off the principal energy Levenson s b d f where it's can have maximum off to. We can have six that you can have 10 and if can have maximum off 14 electrons. Therefore the principal energy level can hold a maximum off 32 electrons and thesis statement is false. Then essays and electron in one s orbital is held closer to the nucleus, then an electron in that two and sorbitol. The one is our retail is the lies in the first principal energy level Oneness. Our video is in the principle it's in the first principle energy 11 and that too is or region is in the second principle and then she live in the first principle Energy level is closer to the nuclear's compared to the second principle energy level. Therefore, the one s orbital is closer to the nucleus. Then the then the electrons in the second orbital. So this one is a truly statement than FCS. An electron in two years are bitten is harder to remove then from an atom than an electron in the one in sorbitol. Since the one is electrons, thes are closer to the nucleus. Therefore, nucleus attracts this electrons in the one its orbital. When were more strongly scenes. One is or written is Louisa to the nuclear's. Then the two and sorbitol. Therefore electrons in one is or region. He's attracted more strongly, then electrons in to S or Britain. And due to this strong attraction for electrons in the one s are within one s Electrons are harder to remove. One s electrons are harder to remove. Therefore, this statement, if that is actually false okay, then GCS and it's orbiting has the shape off this spare with Nicolas and the center of despair the shape of the origins. They represent the electron density. So yeah, she brought or regions represent the electron density. And this retro density is the probability off, which is the probability off finding electrons now for us Orbital day. The condom city is this very little around the neck. Yes, for us. Our leader, the electron density. Yes, it's very good and onto the nucleus. Therefore, the shape of the S orbital is physical and this one is a truest statement. Then H says that each two player wooden has the shape off a dumbbell with the nucleus of the meat point off the dumbbell. Now for two or within the electron density is dumbbell shaped and the nuclear instruments at the middle. So this statement is that truly statement, so for to be or riddles the electron density is dumbbell shipped and the new cleans is on the meat point. Therefore, the toupee or bitten is dumbbell ship. Then the three to be obedience in an atom are aligned parallel to each other. This one is a false statement that toupee than two p or billions. They are not parallel to each other. They are at right angles to each other to play our regions our right angle to each other. So it is a false the statement then, Jay says, and orbital is a region office space that can hold two electrons in an atom shall subdivided into assumptions and within these substances transcend cooked in orbit ins. So within the suck shells, electrons earned grouped in or regions and these are regions hold can hold a maximum off. Two electrons can hold maximum off two electrons. Therefore, this one again is a true statement. Then cases the second shell contents one s our video and to be orbiter's the second shin, it can hold a maximum off eight electrons. It can hold a maximum off 80 electrons and these electrons can occupy that to s and that to your readers. Two s orbital is a single s orbital and it can hold two electrons and to be orbital's. It consists off three sets off orbital's and can hold six electrons. Therefore, the second shell can contain a maximum off to plus six, which is the eight electrons. It can hold maximum off eight electrons and they're 42nd shell contents one s orbital and three p, or which have signed this one is that truest statement. Then else is in the ground State electron configuration, often atom. Only the lowest energy or bitten czar occupied the electron configuration, often atom. It gives the description of orbiters in which the electrons occupy so electron configuration gives hm description off the origin in which the electrons occupy in the ground. The street electron configuration electrons occupy the orbit. Dent's, which are having the lowest energy and all the orbiting SOF Higher energy remain empty in crowned state. In electron configuration, electron occupy okay or victims off lower energy. Therefore, this one is the truest statement. Then the statement m say's that, and spinning electrons behave as a tiny bar magnet with the North Pole and the South Pole. Spinning electron produces a tiny magnetic field around it and alliance itself in the north and south direction. So spinning Electron creates a tiny magnetic field, mhm and a line aligning itself in the north and south direction. Therefore, I'm spinning. Electron is considered as a tiny magnet with an awful and the sound South Pole and M is a true statement. Then the next year, statement says, and orbital can hold a maximum off two electrons with their spins with their is prince parent and orbital can hold her maximum off. True electrons and the magnetic fields off the electrons are aligned in opposite orbital can hold maximum off two electrons and the magnetic field off. The two electrons are aligned in opposite. These are a landing opposite direction. And this electron CERN called spring band thes electrons are called his spin parents. Therefore, this given a statement is also true. Yeah, then statement or Saiz? Yeah, the statement forces that were electron spins mean that the two electrons are aligned with their spins, not full to not fall and South pole to South Pole. This one is off. Also statement because apparently electron expense means means that two electrons are aligned with their spins, not fall through South Pole. Not all toe Southold and South Pole to north fall. Therefore, this one is a also statement. Then the next day statement says an orbital books diagram puts all of the electrons often atom in one box with their spin aligned. This is the B statement. Let's speak around if it is true or false. Yeah, in the orbital box diagram, these air used to present the electrons. So we used this kind off orbital box diagram to represent electrons. And in this diagram, each boss they represent orbital's. So these books represent all details. Since each orbital can hold maximum off two electrons. Therefore, each box can hold maximum off two electrons, an unplanned electron is represented by arrow with with Only the arrow is shown in one side, and with this head up and when to electrons apparent. Then we showed two arrows and in the opposite direction. This head is in the opposite direction, so an orbital box diagram it does not feel all the electrons often atom in one box with their expense aligned. Therefore, this one is a false statement. Then Q Q says that an orbital box diagram off carbon. I don't choose to unpadded transfer leaders draw down orbital Bob Stack from for Carbon Adam. We know that number for carbon is six. Therefore, it is having six electrons after an internal state where oneness is having to to us having to Andi toupee is having and under two electrons. Therefore, here we can see that the two p orbital is showing to unfair int electrons, and this one is a true statement. Then our sayings that lewis dot structure shows only the electrons in the valence ship often atom when we write Misrata structure. For another, the symbol off the element is presented like for carbon. For example, the symbol off the symbol C for carbon is presented and it sounds with the dots and in this case that dots represent a number of valence electrons in the outermost shell off the atom. Therefore, carbon is having four out Almost It is having four outermost shell electrons in this case, two plus two. And this is how the carbons lose his job. This structure is shown and if this one is that true, Therefore, this one is a true statement that the lewis dot structure shows only the electrons in the valence shell. This is the truest statement, then statement s It says the characteristics of Group one element is that each has one unplanned electron. The group number gives the number of balance electron which are the outermost shell electron. Since elements in group one A, they have only one valence electrons and these electrons are always unfair. And therefore, this is a true statement. Yeah, yeah. So Group One a elements him one valence electron, which is always I'm scared and they're from this one is a true statement. Then the last 20. It says the characteristics of Group six element is that it has six unplanned electrons in its valence shell. This is not a true statement. This is definitely off. Also statement Let us go to the explanation. The group number. It gives the number of Venice electrons in the well after most racial forming group elements. The group number group number gives the number off well in select trump in the outermost region. What? It does not represent the number off the number off unpaid electron for groups. Six elements. They definitely have six valence electrons. And among the six electrons, two electrons, they go to the S orbital and the remaining for electrons they occupy. We are wiggles. Yeah, and the true electrons which are in the S origin. They are paired and the remaining four electrons among them to our parents and two are not bent. They are unplanned. Therefore it is a false district. False. The statement that Group Six elements Andi, is that each has 600 electrons. No, they're not having 600 electrons, they're having to unplanned electrons. And therefore this is a

The author of this text book seems to really like large problems with many true and false statements. Uh, there's a, a very good example, although these problems may seem a little tedious, they are very helpful in helping you to review the major concepts associated with each of the sections. So let's get started statement A to say that energy is quantized means that only certain energy values are allowed. Yes, this by definition is what is suggested by the term quantized. So this is true statement B board discovered that the energy of an electron in an atom is quantized. Yes, the Bohr model shows the energies of electrons being quantized, found at specific distances from the nucleus, often referred to as orbits. We now refer to them as locations where the electrons are found or orbital's statements. See electrons in atoms are confined to regions of space called principal energy levels. So I guess this is correct. Definitely the electrons are in particular regions. They may not necessarily be called principal energy levels. Usually we refer to the region a specific region where two electrons can be found as an orbital. But there are many orbital's that could also well, there are many orbital's that are found in energy levels or principal energy levels. So I guess we could state this statement is true statement D Each principal energy level can hold a maximum of two electrons. Each orbital can hold a maximum of two electrons, so this would be false, but each principal energy level can hold varying numbers of electrons depending on whether it's the first principle energy level or second or third or fourth. And as we increase the principal energy level, we increase the number of electrons that can be found there statement E an electron in a one s orbital is held closer to the nucleus than an electron in a two s orbital. Yes, the lower the principal energy level one instead of to the closer the electrons are that are found in these principal energy levels. To the nucleus statement F. An electron in a two S orbital is harder to remove from an atom than an electron in a one S orbital. Well, it's easier to remove electrons that are farther from the nucleus. Remember the nucleus is positively charged and the electrons are negatively charged. So the closer they are to each other, the harder they will be to pull apart kind of like two magnets. The closer they are, the harder they are to pull apart. So because the two s um orbital electron is farther from the nucleus, it's going to be easier to remove than a one S. So this would be false. The one s. Is harder to remove, statement G. And S orbital has the same shape as a sphere with the nucleus at the center of the sphere. Yes, this is true. This is the shape of a one s orbital statement H A two P orbital has the shape of a dumb bell with the nucleus at the point of the dumbbell. Yes, P orbital's our dumbbell shaped and s orbital's our spherical in shape statement I The 32 P orbital's in an atom are aligned parallel to each other. So it is true that there are 32 P orbital's for each principal energy level. Well, there are 32 P orbital's in the second principle energy level, but they are not aligned parallel to each other. So this is false. They're aligned orthogonal to each other or at 90 degrees to each other. Statement J. An orbital is a region of space that can hold two electrons. Yes, this is what defines an orbital a region within the Adam where two electrons can be found and statement, Okay, the second shell contains one S orbital and three P orbital's. Yes, so the first shell just contains s orbital's. The second shell contains S and P orbital's. The third shell contains S. P and D orbital's and we keep adding a type of orbital for each shell or each principal quantum number. So this statement is true statement L. In the ground state electron configuration of an atom, only the lowest energy orbital's are occupied. Yes, this is what defines ground state where the electrons are found in their lowest occupied energy levels. Excited states are when they are bumped up to higher energy levels than their lowest statement. Emma, a spinning electron behaves as a tiny bar magnet with a north pole and a south pole. Yes, this is true. This is often how we describe a spinning electron with a magnetic moment that would content. That would look like a bar magnet with a north pole and a south pole statement. And an orbital can hold a maximum of two electrons with their spins paired. So we defined an orbital earlier. It is a location where two electrons can be found. So this part is true. But are there spins paired when they are found within the orbital? Yes, they are paired to be paired. That means one is spinning in a direction opposite the other one. And this is what is suggested in a statement. Oh, paired electron spins mean that the two electrons are aligned with their spins north pole to north pole and south pole to south pole. Well pairing, as I stated, suggests that we have one spin in one direction having the north up, say in the south down and the other electron spinning in the opposite direction, having the south up and the north down. So to to suggest that it is north to north and south to south would be incorrect because paired means that they have spins in opposite directions and the north is paired with the south and the south is paired with the north. So that statement is false statement. P an orbital box diagram puts all the electrons of an atom in one box with their spins aligned. So orbital box diagrams do have boxes, electrons go in the boxes with their spins paired. All of that is correct, but there is not one box for all of the electrons. One box would contain only two electrons with their spins paired, not all of the electrons in the atom with their spins paired statement. Q. An orbital box diagram of a carbon atom shows two unpaid electrons. The last two valence electrons of carbon go into two separate P. and those electrons in two separate p orbital's are both um paired. All other electrons are paired. So this statement is true in carbon statement are a lewis dot structure shows only the electrons in the valence shell of an atom of the element. Yeah, that's correct. With lewis dot structures were only using the valence electrons of the atom. It is just the valence electrons that contribute to bonding. And lewis dot structures identify the bonding that occurs within a molecule statement. S A characteristic of group one a elements is that each has one unpaved electron in its outermost occupied valence shell, one a elements only have one valence electron, that one valence electron can go into one orbital. There are no other valence electrons so that one electron would be compared. So this is true. But could we say the same thing about Group six A elements that they have six um paired electrons? No, this would not be correct because we pair up where we can. So although groups six A elements have six UNP aired, I'm sorry, have six valence electrons. They are not all UNP aired.

In this problem. We're going to be recognizing different properties of all of our groups of elements that we've covered in this chapter. Each of these clues is Airlines with one group on the periodic table. And we're going to figure out which group each aligns with. So part a says that a vesper configuration of AX three E. is consistent with this group. Where A. Is our central atom, X. Is our bonded atoms and E. Is electron lone pairs. So if we have three bonded valence electrons and then one electron lone pair, which is to electrons, That means we have five valence electrons. and the group that has five valence electrons is group five A. 15. All right, let's move on to part B. These elements are strong oxidizing agents. So oxidation agents gain electrons so oxidation gains they get more negative. It's easiest to only gain one electrons. one electron. I can speak English. It's all right. So it's easiest to gain one. and the group that wants to gain one electron is group 17. Moving on to part C. Two atoms donate one electron each to form compounds with this group. So once again, we just have to think about this in a logical way. If we have two atoms donating one electron each, that means that this the central atom is gaining two electrons so total. So which group wants to gain two electrons? Group 16 for part D. These have these are strong reducing agents with only one non 0 state. There are a couple of groups that form ionic compounds are strong reducing agents, so reducing agents want to lose electrons. Ionic compounds need medals to form. So it's either Group one or Group two, but Group one is the only group with only one non zero oxidation state. So this answer I apologize for. That is group one. So this group for party has conformed three bond compounds or if it's a central atom can form for without expanding its outer shell. So that points to an n. s. two and P one configuration. So those kind of uh those kind of configurations can make three covalin bonds, which is consistent with group three. However, as a central atom, their electron deficient, which means that they can make 1/4 bond. That's what it means by. As a central atom, they can make four bonds. They have an electron deficiency, and the only group that has an electron deficiency is Group three, and finally, only large atoms are active in this group. Immediately. I think of group eight eight. A group 18 are noble gases because noble gases rarely react. So only the larger and more unstable ones are going to form compounds at all. So


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