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An element M has an atomic number 9 and ...

An element M has an atomic number 9 and mass number 19. Its ion will be represented by
(1) M (2) `M^(2+)` (3) `M^(-)` (4) `M^(2-)`

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The correct Answer is:
3
Since its atomic number is 9, hence it is some halogen (e.g. F). Thus, its ion should exist as `M^(-)` ion as given in choice (3).
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