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

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An element `M` has an atomic mass `19` and atomic number `9`. Its ion is represented by
A. `M^+`
B. `M^(2+)`
C. `M^-`
D. `M^(2-)`
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Correct Answer - C
`M(Z=9) : 1s^2 2s^2 2p^5`
This is fluorine, its ion is `F^-` (formed by accepting an electron to complete its octet) or `M^-`.
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