Question

The atomic mass of an element is equal to the ________ of an atom in the Atomic Mass Unit

Answer 1

Hint: The atomic mass of an element is the average of weights of all the isotopes of that element, in which mass of each isotope is multiplied by the abundance of that particular isotope in nature. Atomic mass is simply the mass of a single atom of an element.

Complete answer:
Atomic mass also includes the mass of subatomic particles that is protons, neutrons and electrons. Generally, atomic mass can be expressed in grams. Atomic mass is the sum of mass of protons, mass of electrons and mass of neutrons. An atomic mass can be defined as the mass equal to one twelfth the mass of an atom of carbon$ - 12$ isotope. Atomic masses are not integers because atomic mass is the average of weights of the isotopes of that element. Averages are less likely to be whole numbers, so atomic masses are not integers.
Therefore, the atomic mass of an element is the average mass of the atoms of an element measured in the atomic mass unit.

Note:
An atomic mass unit is defined as mass that is equal to one twelfth the mass of an atom of carbon$ - 12$. Both protons and neutrons have masses of $1{1}{\text{ amu}}$ and electrons have a mass of $0{\text{ amu}}$. Number of protons present in the nucleus gives us the atomic number of that element.