00:02
Hi there, in this question we are being asked about sodium and the charge on the ion that sodium forms.
00:09
So what is the charge on a sodium ion? well there are several ways to answer this question.
00:14
One i am going to use here is to write out its electron configuration.
00:19
Sodium has 11 protons because it's atomic number 11.
00:24
So therefore it also has 11 electrons as a neutral atom.
00:27
Giving it's configuration 1s2, 2s2, 2p6, and 3s1.
00:39
Right, well we know that all atoms on the periodic table would like to satisfy the octet rule.
00:49
And the octet rule says that they want 8 electrons in their outermost energy level.
01:07
Okay, so as we look at this configuration we see that there is only 1 electron in its outermost energy level.
01:14
The third energy level is its outermost.
01:17
There is only 1 electron in that.
01:19
So to fill up that it would need 7 more.
01:21
That's a lot of electrons to find.
01:24
Or the other thing it could do, look what happens if i just draw a vertical line here...