00:02
Hi there.
00:02
This question asks about atomic radius.
00:07
And the atomic radius is basically the size of an atom from the center of its nucleus to its outermost electron.
00:17
And we can answer this question without looking up the actual values of atomic radius for these elements, just by knowing periodic trends.
00:27
So if we think about the periodic table, sketch out a rough one here to the best of my ability here.
00:35
All right, so we have a rough periodic table here.
00:38
We know that moving across a period, the radii decreases.
00:49
When we move down a group, the atomic radius increases.
00:59
All right.
00:59
So that means that the largest atomic radius on the periodic table is going to be found in the bottom left corner, or francium.
01:10
But francium is not part of this question.
01:12
What we do have in this question are four elements from period three on the periodic table.
01:19
We have sodium, which is n .a.
01:25
It's in group one.
01:26
We have magnesium right next to that.
01:30
In group two, we have silicon, which is over on the other side, in group 4a or 14...