Question

$M{g}^{2+}$ and $F^{-}$ ions differ in which of the following fundamental particles?

• A. Electrons, protons and neutrons
• B. Protons and neutrons
• C. Only protons
• D. Neutrons and electrons

Answer 1

The correct option is B

Protons and neutrons

Magnesium has lost 2 electrons to become $M{g}^{2+}$ ion.

$M{g}^{2+}$ ion has 12 neutrons, 12 protons and 10 electrons.

Fluorine has gained 1 electron to become $F^{-}$

$F^{-}$ ion has 10 neutrons, 9 protons and 10 electrons.