Problem: Copper has the following ground-state electron configuration: [Ar]4s13d10. How many valence electrons does an atom of Cu have?A) 9B) 10C) 11D) 12E) 13

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We’re being asked to determine the number of valence electrons in copper with an electron configuration of  [Ar]4s13d10

We can simply find the # of valence electron by examining the provided electron configuration. Recall that the superscript denotes the number of electron in the shell

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Copper has the following ground-state electron configuration: [Ar]4s13d10. How many valence electrons does an atom of Cu have?

A) 9

B) 10

C) 11

D) 12

E) 13

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