Question

Which of the following is true about the neutral element magnesium ?

• A. 12 protons, 12 electrons, and 24 neutrons.
• B. 12 protons, 12 electrons. and 12 neutrons.
• C. 24 protons, 24 electrons, and 12 neutrons.
• D. 24 protons, 12 electron and 12 neutron.
• E. 12 protons, 24 electrons, and 24 neutrons.

Answer 1

Answer: (B)

12 protons, 12 electrons. and 12 neutrons.

Neutral magnesium atom : ${}_{12}^{24}Mg$

Thus mass number and atomic number of $Mg$ is $24$ and $12$ respectively.

$⟹$ Number of protons $=$ number of electrons $=12$

Also, number of neutrons $=24-12=12$