(i) Atomic number, (ii) Mass number, (iii) Isotopes and ( iv) Isobars. Give any two uses of isotopes.
Answer :
(i) Atomic number : Atomic number of an element is defined as the number of protons present in its atom. It is denoted by 'Z'.
(ii) Mass number : The mass number is defined as the sum of the total number of protons and neutrons present in the nucleus of an atom.
(iii) Isotopes :Isotopes are defined as the atoms of the same element, having the same atomic number but different mass numbers.
( iv) Isobars : Atoms of different elements with different atomic numbers, which have the same mass number, are known as isobars.
Two uses of isotopes :
(i) An isotope of uranium is used as a fuel in nuclear reactors.
(ii) An isotope of cobalt is used in the treatment of cancer.
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