For Aluminium (Al) (atomic number: 13, mass number: 27), which one among the following statements is NOT correct?

Correct option is D

The correct answer is (d) The valency of Al is 2.
Explanation: Aluminium (Al) has an atomic number of 13, meaning it has 13 electrons and 13 protons. Its mass number is 27, so the number of neutrons is calculated as 27 (mass number) - 13 (protons) = 14 neutrons. Aluminium’s valency, however, is 3, not 2. This is because aluminium tends to lose three electrons to achieve a stable, noble gas electron configuration similar to neon. Hence, the statement that the valency of aluminium is 2 is incorrect.
Information Booster:
· Option (a) - Number of electrons: Aluminium has 13 electrons, matching its atomic number.
· Option (b) - Number of protons: With an atomic number of 13, it has 13 protons.
· Option (c) - Number of neutrons: Correct, as it has 14 neutrons (27 - 13).