0:00
Hello students.
00:01
So in this question i have a bromine atom whose number of electrons is 35 and i have to calculate the total number of unpaired electrons in the bromine.
00:24
So to calculate this i have to first write the electronic configuration of bromine which is my next part of the question.
00:31
So bromine it is 35 right? so let us use the raindrop model here.
00:40
So we have 1s, 2s, 2p, 3s, 3p, 3d, 4s, 4p, 4d, 4f.
00:53
Let us keep it like this only.
00:56
So the raindrop model says that the electrons will be filled in this way.
01:01
So let us write the electrons.
01:06
So 1s means 2 electrons, 2s 2 electrons, 2p 6 electrons.
01:13
So total of 10 has been filled.
01:16
Let's move on to 3.
01:17
3s, 3p, 18 electrons filled.
01:23
Then we have, after 3p we have to fill 4s not 3d because the energy level dictates so.
01:33
So we have 4s.
01:35
So let us fill the 4s then we can fill the 3d.
01:41
So a total of 2, 4, 6, 10, 12, 18, 20 electrons have been filled.
01:48
So we have to fill 10 electrons and after 3d we can fill the 4p here...