What is the general outer electronic configuration of the coinage metals?

What is the general outer electronic configuration of the coinage metals?

Options

(a) ns², np⁶
(b) (n-1)d¹⁰, ns¹
(c) (n-1)d¹⁰, ns²
(d) (n-1)d⁹, ns²

Correct Answer:

(n-1)d¹⁰, ns¹

Explanation:

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