Question

what is base quantity​

Answer 1

Answer:

Isotopes are atoms of the same element with different numbers of neutrons. Because they contain different numbers of neutrons, isotopes have different atomic masses. The average atomic mass of an element is calculated by taking the weighted average mass of the element's naturally occurring isotopes.

Answer 2

Explanation:

Physical quantities are quantities that can be measured. Base quantities are physical quantities that cannot be defined in terms of other quantities