Question

Write abbreviated electron configurations for the following and underline all valence electrons.

a) Platinum (Pt)

b) Arsenic (As)

Answer 1

Platinum atomic number is 78

Electronic configuration : [ Xe ] 4f¹⁴ 5d⁹ 6s1

  Valence electrons are 6s¹

Arsenic has atomic number is 33

Eletronic configuration : [ Ar ] 3d¹⁰ 4s² 4P³

Valence electrons are 4S² 4P³

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