Question

Give one example each of:
(a) a monatomic element
(b) a diatomic element
(c) a particle that is smaller than an atom
(d) a metal
(e) a mixture of gases

Answer 1

(a) a monatomic element: Helium is a monatomic element with symbol He.
(b) a diatomic element: Chlorine is an example of diatomic element with formula Cl₂.
(c) a particle that is smaller than an atom: Proton is a particle that is smaller than an atom and is present in the nucleus of an atom.
(d) a metal: Aluminium (Al) is a metal.
(e) a mixture of gases: Air is a mixture of gases such as nitrogen, oxygen, water vapour and carbon dioxide.