Question

8. Explain with examples (i) Atomic number, (ii) Mass
number, (iii) Isotopes and (iv) Isobars. Give any two
uses of isotopes.​

Answer 1

Answer:

(i) The atomic number of a chemical element is the number of protons in the nucleus of an atom of the element.

eg: All carbon atoms have the atomic number of 6, whereas all atoms of Oxygen have 8 protons in their nucleus.

(ii) Mass number is the sum of the number of nucleons in an atom.

eg: An atom of carbon has 6 protons and 6 neutrons. Thus, its mass number is 12.