Question

Define the following terms:
1. Atom
2. Isotope
3. Atomic number
4. Atomic mass number

Answer 1

(1) Atom: The smallest part into which an element can be divided.

(2) Isotope: Species having same atomic number but different mass number.

(3) Atomic number: Number of electrons present in an atom which is equal to number of protons in a neutral atom.

(4) Atomic mass number: Sum of the number of protons and neutrons i.e, nucleons present in an atom.