The electron configuration for $C u$ is $1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 4 s^{1} 3 d^{10}$ .
How many inner core electrons does copper contain?

1

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10

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18

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28

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Solution

The correct option is D $28$
The valence shell of Cu is fourth shell. Thus all electrons except for electron in $4 s$ sub shell are its core electrons. Thus total core electrons are $2 + 2 + 6 + 2 + 6 + 10 = 28$ electrons. Hence Cu $28$ core electrons.

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