Answer:
The symbol of the Element is simply just the abbreviation.
Mercury: Hg
Potassium: K
Nitrogen: N
Copper: Cu
Sulphur: S
Carbon: C
Chlorine: Cl
Oxygen: O
The number of unpaired valence electrons determine the radical in any element.
Mercury: Hg 2+
Potassium: K+
Nitrogen: N 2+
Copper: Cu 2+
Sulphur: S 2-
Carbon: C 4+
Chlorine: Cl -
Oxygen: O 2-
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