Isotopes and Atomic mass

Question 1

what is mass number

Answer 1

protons plus neutrons

Question 2

what is an isotope

Answer 2

atoms with the same number of protons but different number of neutrons
can be differentiated using mass number

Question 3

isotopic abundance

Answer 3

the amount of a given element that exists in nature expressed as either a decimal or percentage of the total amount of that element

Question 4

what is atomic mass

Answer 4

the weighted average mass of all the isotopes of that element.
Measured in atomic mass units (u)

Avg Atomic Mass = (abundance of isotope1 * mass1) + (abundance of isotope2* mass2)….