Question

18. i) Define isotope with example.
ii)Define mass number.​

Answer 1

Answer:

(a)Isotopes can be defined as the variants of chemical elements that possess the same number of protons and electrons, but a different number of neutrons. For example, uranium-235 and uranium-239 are two different isotopes of the element uranium.

(b)Mass number, the sum of the numbers of protons and neutrons present in the nucleus of an atom.

Answer 2

Answer:

THE ATOM WHICH POSSES THE SAME ATOMIC NUMBER BUT DIFFERENT MASS NUMBER IS CALLED ISOTOPE

MASS NUMBER OF AN ATOM IS DEFINED AS THE SUM OF PROTONS AND NEUTRONS

Explanation: