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

Q.8:- Explain with examples (i) Atomic number, (ii) Mass number, (iii) Isotopes and (iv) Isobars.

Give any two uses of isotopes.

 

Answer:-

(i) Atomic Number : The number of protons present in the nucleus of an atom is called atomic number. It is denoted by Z. e.g: fs i.e., atomic number = 20

(ii) Mass Number: The sum of the number of protons and neutrons present in the nucleus of an atom is called mass number. It is denoted by A. e.g. fs  i.e., mass number = 40

image002

(iii) Isotopes : The atoms of the same elements having same atomic number but different mass numbers are called isotopes, e.g. image003 and image004

(iv) Isobars : The atoms having same mass number but different atomic number are called
isobars, e.g.: image005 and  image006

(v) Uses of isotopes : (i) As nuclear fuel: An isotope of uranium (U – 235) is used as a nuclear fuel.
(ii) In medical field : An isotope of cobalt is used in the treatment of cancer.