Write the number of valence electrons for the following atoms.

Carbon (C)

Phosphorus (P)

Potassium (K)

Oxygen (O)

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Solution

Atom Atomic number Electronic configuration Valence electrons

Carbon (C) 6 2, 4 4

Phosphorus (P) 15 2, 8, 5 5

Potassium (K) 19 2, 8, 8, 1 1

Oxygen (O) 8 2, 6 6

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