|
Group # in the Periodic
Table
|
1
|
4
|
5
|
6
|
7
|
8
|
|
Representative
atom
|
H
|
C
|
N
|
O
|
F
|
Ne
|
|
# of electrons in the
valence shell = Group #
|
1
|
4
|
5
|
6
|
7
|
8
|
|
# of electrons needed to
fill the valence shell = (2 or 8) - Group
#
|
2 -1 = 1
|
8 - 4 = 4
|
8 - 5 = 3
|
8 - 6 = 2
|
8 - 7 = 1
|
8 - 8 = 0
|
|
# of covalent bonds this
atom forms
|
1
|
4
|
3
|
2
|
1
|
0
|
|
# of non-bonding
electron pairs = [Group # - #
Bonds]/2
|
0
|
0
|
1
|
2
|
3
|
4
|
|
Example
|
H-H
|
|
|
|
|
|
|
Valence Shell Electron
Configuration
|
1s2
|
2s22p6
|
2s22p6
|
2s22p6
|
2s22p6
|
2s22p6
|