00:01
In this problem, we are asked to write out the electron configurations of these elements.
00:05
For the first one, we locate the element, which we find is in the 4p block.
00:11
So i'm going to use noble gas configuration.
00:15
We're going to find the noble gas in the previous row, and then we are going to put that name in brackets.
00:22
So that implies that arsenic has the electric configuration of everything up until our gun.
00:30
So it's 1s2, 2s2, 2p6, 3s2, 3p6.
00:35
So everything up until then is filled in.
00:38
That's what it means when we have the noble gas in brackets.
00:43
So then we are going to fill in everything past the argon.
00:47
So we have 4s2 and then the 3d is filled in.
00:50
So 3d10 and then it's 4p, 1, 2, 3.
01:00
So for the next one, we are going to do chlorine.
01:03
So for chlorine, we are, our.....