Question

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

A
M+
B
M
C
M2+
D
M2

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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