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klasskru [66]
3 years ago
6

1s22s22p 3s23p64823d3

Chemistry
1 answer:
emmainna [20.7K]3 years ago
8 0

Answer:

B. 3

Explanation:

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

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Explanation:

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<u><em>Using cross multiplication:</em></u>

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