00:01
We're going to use periodic trends to predict which of the following elements has the smallest atomic radius.
00:14
And we are going to pick from sodium, fluorine, and potassium.
00:23
So here's sodium.
00:25
Floreane is way over here and sodium's right here.
00:30
So our smallest atomic radius here will be fluorine, and that's because it's in the second period.
00:46
And, you know, because if you'll look moving up, where is my atomic radius? atomic, there it is.
01:00
Atomic radius increases moving down.
01:04
Next, predict which has the largest radius.
01:14
And we're given indium 3 plus, selenium, 2 minus, strontium, 2 plus, and rubidium, 1 plus.
01:36
So let me see where these are.
01:38
Where is indium? selenium is right here.
01:47
Strontium is right here.
01:49
Rubidium is right here.
01:53
Indian, i think is in, i think it's right here.
01:57
I got to go look at my periodic table.
02:01
Yes, it is, right under gallium.
02:03
So we're looking for the largest radius.
02:07
Now, if i'm looking here, selenium is in group two or group one, two, period one two three four this in the fourth period indium is in the fifth fourth fifth selenium fifth and fifth so i'm going to go rubidium as my largest here i'm going to verify that i'm going to look up ionic size periodic table oofta i hope this one has it on here and i've got indium is it's the underneath indium is 80 for the 3 plus selenium is 198 it's going to be 198 strontium is 118 and ribidium will be 152 so this one is going to be largest and that's i wasn't 100 % sure on that one because since this is negative anions are larger than their corresponding atoms.
03:58
Oh, i should have known that because when they lose they'll be in the same row.
04:01
Yeah, i knew that.
04:07
What else? use the noble gas notation and write ground state configurations for these ions.
04:15
So we're going to do electron configs.
04:22
For first we have lithium plus.
04:28
I'm not going to use a noble gas configuration for that one.
04:31
It's one s2...