A trinegative ion of an element has 8 el...

A trinegative ion of an element has 8 electrons in its M shell. The atomic number of the element is

A

15

B

18

C

20

D

16

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Since electronic configuration of the triengative ion is 2,8,8 the electronic configuration of the neutral atom is 2,8,5 and its atomic number is 15.

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