00:01
This question wants us to consider manganese, which has an atomic number of 25, meaning there's 25 protons and 25 electrons.
00:08
And it says to note that it has two electrons in the 4s subshell.
00:13
How many does it have in a 3d sub shell? explain your answer.
00:16
So i went ahead and wrote out all the subshells here, starting with the first one.
00:20
So we first fill the n -equals one state.
00:22
So we have 1s, and s can have up to two electrons maximally.
00:26
So this is 1s squared.
00:28
So what's in the exponent, the square value, is the number of electrons in that state.
00:34
Next, we fill the n equals two state, starting with the lowest sub -shell because it has the lowest energy.
00:40
So this is 2s squared...