Question

$Ne$, $N{a}^{+}$ and $F^{-}$ have same :

• A. mass number
• B. number of nucleous
• C. number of electrons
• D. number of protons

Answer 1

The correct option is C number of electrons

$Ne$ has 10 electrons.

$Na$ has 11 electrons.

${Na}^{+}$ has 10 electrons as it has lost 1 electron.

$F$ has 9 electrons.

$F^{-}$ has 10 electrons as negative sign shows gain of 1 electron.