Which particle contains the greatest number of electrons?
1. Na
2. Na+
3. F
4. F-

Na

Explanation:

The atomic number of sodium is 11 while that of fluorine is 9 . Thus the number of electrons in sodium are 11 while in fluorine are 9 .

The cation of an atom form when atom lose electron.

Na → Na⁺ + e⁻

it means the cation of sodium loses its one outer most electron. Thus it has 10 electron while Na atom has 11 electron.

On other hand fluorine has  9 electrons.

The anion of an atom form when it gain electron.

F + e⁻     →    F⁻

Thus the number of electrons in given species are,

Na = 11

Na⁺ = 10

F = 9

F⁻ = 10

Na has more number of electrons.

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