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21 October, 14:10

1s22s22p 3s23p64823d3

How many valence electrons does this atom have?

A. 2

B. 3

C. 5

C. 11

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Answers (1)
  1. 21 October, 14:25
    0
    B. 3

    Explanation:

    A valence electron are always in the final outer shell, so it's always the last number.
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