What is meant by atomicity ? Name a diatomic element.
Atomicity of an element is the number of atoms in a molecule of a substance. example of a diatomic element is nitrogen molecule.
Answer the following questions.
(a) What is the difference between the models of the atom proposed by Thomson and by Rutherford?
(b) What is the characteristic property of the element hydrogen?
(c) What is meant by valency?
(d) What is meant by atomic mass number?
(e) Name the fundamental particles in an atom.