Question

An isotope of uranium is ₉₂Y²³⁸, i.e., it has mass number 235 and atomic number 92.
Mention the relationship between ₉₂U²³⁵ and ₉₂U²³⁸.

Answer 1

₉₂U²³⁸ and ₉₂U²³⁵ the difference is in their atomic masses but their atomic number is the same i.e., both have the same atomic number 92. The elements, that differ in their atomic masses but have the same atomic number are called isotopes, hence ₉₂U²³⁸ and ₉₂U²³⁵ are isotopes of the element uranium.