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Argon has a larger average atomic mass than potassium, yet it is placed before potassium in the modern periodic table. Explain....

Question

Argon has a larger average atomic mass than potassium, yet it is placed before potassium in the modern periodic table. Explain.

Argon has a larger average atomic mass than potassium, yet it is placed before potassium in the modern periodic table. Explain.



Answers

Argon has a larger average atomic mass than potassium, yet it is placed before potassium in the modern periodic table. Explain.

Chapter three Problem. Any sixes? Potassium is our Harley Reactive metal. Where is our God? Is inert gas Explain differences based on their electron configurations. So it's right. The light truck configuration of each potassium lito, nineteen electrons. So you have one Has to to ask too two p six, three years too back in the people walk with three p six. Then it's in the fourth period. Ask Blak. So we finish up with four s. Then we have our gun. We can't the exact same way one has to to us to enter the people arc with TP six, three years too. And we finish off here. Three p six, because are gone is the sixth element in the P block in the third period. Phil, let's see what this lecture configuration thousands. The outer energy level represents the never Vaillant light shines. This case There are eight minutes electrons, which means it has a complete outer show where it's the potassium. There's only one reason to, like try here in the outer show, because on the one day that Solectron it is more likely to get rid of that one day. This electron very, very quickly to have a complete our show that would be in the third energy level of the third period. Therefore, potassium is going to be having reactive because there's one day that's electron that can be easily removed to give that complete Our show. Where is our God is less reactive, in this case, absolutely inert because it has a complete our show.

The atomic mass. Simply put, is just the mass of a single atom of a particular element or, more specifically, a single adam of one ice, a topic form of the particular element. But because elements can have Adams of different number of neutrons than their atomic mass can change, and the relative abundance of those ice a topic forms in nature can vary. So the average atomic mass they're sometimes called a weighted average atomic masses. What's found in the periodic table, and it takes into account the average mass, considering all the isotopes and their relative abundance.

So we're looking at chlorine are gone. And potassium. So chlorine is right over here. Arden is a noble gas and count, uh, potassium is only in group one. Okay, so we're going to use their electron configurations to predict their re activities. So chlorine in group 17 That means it has seven outer electrons in its intelligent. And so we know that hela jin's tend to form salts, um, with alkali metals. And so, um, what's first? Right, the electron configuration or chlorine? So, um, starting from, um, the one s or little right? Chlorine has the full, um, one s orbital. So we're gonna even superscript two, um, And then to us, too. Two p six. Yes, to And OK, so hurry. P three p. Orbital chlorine is it has five electrons in that orbital on, so it would be written as Greek key drive. Okay. And so that's chlorine and then are gone. Has one more pro tone and one more electron. And so it looks almost the same, except for trying an extra election at the end. So want us to Teoh two areas to I mean to me, the iss two and so on. Martin has another electoral under so breathing the P six and then passing. And we've just added another electron, but it's in the fourth period. So we're gonna have, um, the same price bargain, But with for us what? And for a shorthand notation you can you can replace that with the, um, with the, uh, abbreviation of the note near its noble gas and brackets for potassium. We could look, the electron configuration could look like this. Okay, so now we can try and predict the reactivity. So noble gases. We know because we have the full violence show, Um, they are very nonreactive. They wouldn't really lose or gain. Electrons are easily, whereas chlorine that three p five on orbital means that it just needs one more electron to have like that complete outer shell. And so it is more likely to gain an electron informant can island, whereas potassium. It has the extra electron in the four s orbital, so it's more likely to lose an electron and form a cut on with a positive charge.

Who today we'll be looking a Chapter six Question 80 which asks us to consider why the masses that men delay have calculated for various elements are different than the masses we see on the periodic table today. So to start with, we need to know a little bit of history. It, as it happens in Minda, leaves time. There was a meeting of all of the chemist, the International Union of Chemistry, that determined that the element hydrogen so element one hydrogen would be the standard for atomic masses and hydrogen was given a mass of one atomic mass unit A m U. Thus, if you measured something say, like nitrogen Element seven, which has 14 nuclear Jones in the nucleus, it would weigh approximately 14 times more unless it would be given a mass of 14 a. M. U. The main difference today is that we now use a different standard, and we have much more sophisticated analytical equipment. So this is in Mandalay is time and today we now use carbon 12 as our standard. So excuse me. Carbon has 12 nuclear arms, but it is element number six, So carbon has 12 nuclear owns and so we define the mass of 12 carbon, a particular isotope of carbon to the massive 12. Exactly, because we can measure much more finally and can measure these decimal points, and these they're still am you. We can also measure hydrogen and similar things with much more precision and accuracy than were available in Mandalay is time. So hydrogen is now Wade to be 1.79 I am you and it's this extra level into the decimal points, which is true for nitrogen and all of the other elements compared toward given reference. That makes the masses of the periodic elements today slightly different than the masses that Mandalay have calculated back in his time.


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