Let's put in sodium here, magnesium here, silicon and sulfur, and were asked to determine which of these is the largest nucleus and which one is the smallest? Now we can see that all three, all four of these elements are on the same period of the periodic table. Um, we have a six s orbital, and just mathematically, it works out that two s orbital is much smaller than a six s orbital, even though there are more protons in the Francine Nucleus. And this is because as we go to different periods, for example, with the lithium case, we have a two s orbital versus down here at the bottom with Francie. As we go down the periodic table, the atomic radius increases. So we'll draw big circle over here and a little circle over here. And so as we go across the periodic table, we have more positive charge pulling on the electrons and thus are nuclei gets smaller. And so it actually pulls both of these electrons tighter in this case compared to the lithium case.
Smallest atomic radius plus#
This electron is feeling plus four versus plus three. Each electron is now feeling the pull of an even more positively charged nucleus. The electron is attracted to the nucleus, However, in this case, that we've gained the same number of electrons. In each of these cases, even though we've gained the same number of electrons as we have plus charges, the electrons all feel the same nuclear pool, so this electron is being pulled by a plus three nucleus, so we have a minus charge attracted to a positive charge. So let's look at, say, lithium with one valence electron, beryllium with two and, um, Boron with three now. And in each of these cases, we also gain one more electron. So let's start with, say, a plus three nucleus versus a plus four nucleus and so on. And this is because, as we go across the periodic table, are elements gained more protons. So as we go from left to right across the periodic table, the atomic radius decreases.
Someone's gonna draw the periodic table but helium in there and put hydrogen in and then have our little contraction. So first, let's just remember what the trend is with atomic radio I across the periodic table.
Smallest atomic radius how to#
Hello Today we'll be talking about Chapter six questions 16 and how to compare atomic radio of different elements using the periodic table.