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Question

An element $$M$$ has an atomic mass $$19$$ and atomic number $$9$$. Its ion is represented by


A
M+
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B
M
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C
M2+
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D
M2
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Solution

The correct option is B $$M^-$$
Electronic configuration of M is $$ 2, 7$$. It can accept an accept in order to have stable configuration. So ion is represented by $$M^{-}$$.

Chemistry

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