Question

Define the term mass number and isotopes

Answer 1

Answer:

total no. of protons and neutrons in nucleus is called mass number

atom having different number of neutrons than standard for this element called isotope

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Answer 2

Answer:

Explanation: ISOTOPES- each of two or more forms of the same element that contains equal number of protons but different number of neutrons in their nuclei,and hence differ in relative atomic mass but not in chemical properties.

MASS NUMBER- the mass number is the total number of protons and neutrons in an atomic nucleus.