Key elements

Hydrogen
Symbol
Atomic Number
Valence Electrons
H
1
1
Helium
Symbol
Atomic Number
Valence Electrons
He
2 (noble gas)
2
Carbon
Symbol
Atomic Number
Valence Electrons
C
6
4
Oxygen
Symbol
Atomic Number
Valence Electrons
O
8
6
Sodium
Symbol
Atomic Number
Valence Electrons
Na
11
1
Magnesium
Symbol
Atomic Number
Valence Electrons
Mg
12
2
Chlorine
Symbol
Atomic Number
Valence Electrons
Cl
17
7
Potassium
Symbol
Atomic Number
Valence Electrons
K
19
1
Calcium
Symbol
Atomic Number
Valence Electrons
Ca
20
2
Nitrogen
Symbol
Atomic Number
Valence Electrons
N
7
5
x

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