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If a uninegative ion has 10 neutrons and...

If a uninegative ion has 10 neutrons and 9 protons , electronic configuration of the atom of the element is

A

2, 8, 1

B

2, 7

C

2, 8

D

2, 8 , 8

Text Solution

Verified by Experts

The correct Answer is:
2
`X^(-) = 9` protons (Z)
10 neutrons
10 electrons
`Xoverset(+1e^(-))toX^(-1)` (9 electrons) " " (10 electrons)
Therefore , the electronic configuration of an atom is 2 , 7
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