Question

why are molecules like h₂, o₂, and n₂ considered diatomic?
a) they are composed of two atoms of the same or different elements.
b) they only contain two electrons.
c) they are composed of two protons.
d) they have a bond formed by sharing two pairs of electrons.

Explanation:

A diatomic molecule is defined as a molecule composed of two atoms. The prefix "di -" means two. In the case of \(H_2\), \(O_2\), and \(N_2\), each molecule has two atoms of the same element. Option A correctly states that diatomic molecules are composed of two atoms (of the same or different elements). Option B is incorrect because the number of electrons is not the defining characteristic of a diatomic molecule. Option C is wrong as protons are in the nucleus and not the basis for defining diatomic molecules. Option D is incorrect as it refers to a specific type of bonding (double - bond in the case of sharing two pairs of electrons) which is not the general definition of a diatomic molecule.

Answer:

A. They are composed of two atoms of the same or different elements.