00:01
Hi there.
00:02
This question is asking about atomic radius.
00:06
Atomic radius is just what it sounds like.
00:09
It is the radius of an atom.
00:18
Or in other words, the atom size.
00:23
Okay, and we have four elements here that we want to put in order of increasing atomic radius.
00:30
We have radon, which is a noble gas, down near the bottom.
00:36
We have xenon, which is directly above radon.
00:43
We have neon, which is up here.
00:48
And we have krypton, which is above xenon.
00:54
Okay, so these are the four that we want to put in order from smallest to largest.
01:06
Well, to do this, we need to know about the periodic trend for atomic radius.
01:10
The trend is that moving down a group, the atomic radius increases.
01:21
This is because we are adding additional energy levels...