### Can someone help me understand electron shell calculations

Posted:

**Apr 07, 2010 12:49 pm**I am trying to get my head around calculating electron shells from a given element and really getting headaches from it

For example, I can calculate the electron shells for Ununquadium having an atomic number of 114 by this route

1s2,2s2,2p6,3s2,3p6,4s2,3d10,4p6,5s2,4d10,5p6,6s2,4f14,5d10,6p6,7s2,5f14,6d10,7p2

I'm using shell numbers when I work it out instead of letters as it's more intuitive to me

Which gives me electron shells of

K2

L8

M18

N32

O32

P18

Q4

2,8,18,32,32,18,4

But I run into problems for example I try to work things like Darmstadtium with an atomic number of 110

So I start with

1s2, 2s2, 2p6, 3s2, 3p6, 4s2, 3d10, 4p6, 5s2, 4d10, 5p6, 6s2, 4f14, 5d10, 6p6, 7s2, 5f14, 6d8 (only 8 remaining from 110)

Then I tot them up

K2

L8

M18

N32

O32

P16

Q2

2,8,18,32,32,16,2, but the actual electron configuration is 2, 8, 18, 32, 32, 17, 1... I don't understand why 1 electron is being moved from Q to P

Please anyone who can explain this can you do it as monosyllabic and in crayon if possible, I've killed my brain trying to understand this!

For example, I can calculate the electron shells for Ununquadium having an atomic number of 114 by this route

1s2,2s2,2p6,3s2,3p6,4s2,3d10,4p6,5s2,4d10,5p6,6s2,4f14,5d10,6p6,7s2,5f14,6d10,7p2

I'm using shell numbers when I work it out instead of letters as it's more intuitive to me

Which gives me electron shells of

K2

L8

M18

N32

O32

P18

Q4

2,8,18,32,32,18,4

But I run into problems for example I try to work things like Darmstadtium with an atomic number of 110

So I start with

1s2, 2s2, 2p6, 3s2, 3p6, 4s2, 3d10, 4p6, 5s2, 4d10, 5p6, 6s2, 4f14, 5d10, 6p6, 7s2, 5f14, 6d8 (only 8 remaining from 110)

Then I tot them up

K2

L8

M18

N32

O32

P16

Q2

2,8,18,32,32,16,2, but the actual electron configuration is 2, 8, 18, 32, 32, 17, 1... I don't understand why 1 electron is being moved from Q to P

Please anyone who can explain this can you do it as monosyllabic and in crayon if possible, I've killed my brain trying to understand this!