To draw the configuration you need to know the electronic configuration first. It comes from the arrengement of the electrons according to the levels s, p, d, f. It goes like this
1 s
2s 2p
3s 3p 3d
4s 4p 4d 4 f
5s, 5p, 5d, 5f
There is no e, g, nor h.
To write the configuration you have to do it putting the electrons in each orbital (s, p, d) but filling them in diagonal way (from 3p to 4 s, from 3 d to 4p, etc)
You cannot go 1 s, 2s, 2 p, 3s, 3p, 3d, 4s 4p, 4d, 4f (Wrong)
You have to do it like: 1s, 2s, 2p, 3s, 3p, 4s, 3d, 4p, 5s, 4d, 5p
So for our case, arsenic has 33 protons so we need to have 33 electrons, we have to put those electrons in these levels, s,p,d (s can have 2 electros, p up to 6 and d up to 10) so
Arsenic 33
1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p3 . Now let me arrange the coeffients
1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p3
Now let´s bring back the electronic configuration diagram
1 s Here you can have 2 electrons
2s 2p Here you can have 2+6 = 8 electrons (Total electrons 2 from level 1+ 8 = 10 )
3s 3p 3d Here you can have 2 + 6 + 10 = 18 electrons ( Total electrons 10 + 18 = 28)
4s 4p 4d 4 f Here you can have 2 + 6 + 10 + 14 = 32 electrons (We don´t need too many just five in order to reach 33 electrons, 28 + 5)
For our specific case we have
Level 1: 1s2
Level 2: 2s2 2p6
Level 3: 3s2 3p6 3d10
Level 4: 4s2 4p3
You are asked to do a drawing, what we have to do is to draw 4 circles (4 levels) on inside the other, then you will put some dots (electrons) in every circle in order to match the 33 electrons.
In the first circle you will put 2, in the next you will put 8, in the next you will put 18 and in the last one you will put 5.
You repeat it for chlorine.
It has an atomic number of 17, which means it has 17 protons, therefore 17 electrons. the electronic configuration is
1s2 2 s2 2 p6 3s2 3p5
Levels would go:
Level 1: 1s2
Level 2: 2s2 2p6
Level 3: 3s2 3p5
The drawing would be just 3 circles, one inside the other, the first one with 2 electrons, the third one with 8 electrons and the last one with 7 electrons
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