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Oxidation States

An atom has e...

Question

An atom has electronic configuration 2, 8, 7.
What is the atomic number of this element?

A

14

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B

17

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C

16

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D

15

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Solution

The correct option is B
17

The atomic number of this element is 17. Atomic number is the sum of all the valence electrons in an atom. It is 2 + 8 + 7 = 17.

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