Answers: 1
![V:[Ar]3d^34s^2](/tpl/images/0110/1262/8d446.png)
![Nb:[Kr]4d^35s^2](/tpl/images/0110/1262/6fc37.png)
![Cu:[Ar]3d^{10}4s^1](/tpl/images/0110/1262/2be08.png)
![Tl:[Xe]4f^{14}5d^{10}6s^26p^1](/tpl/images/0110/1262/91db4.png)
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Which element has 3 valence electrons in the 4d sublevel? a. v b. nb c. cu d. tl...
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