# What is atomic mass?

Jun 3, 2018

The sum of mass of proton,electron and neutron (individual components) of an atom is atomic mass.

#### Explanation:

Simple the definition lies in the meaning itself. The mass of an atom is refereed as its atomic mass.

Measured in:- amu or atomic mass unit

Commonly the atomic mass is calculated by adding the number of protons and neutrons together whereas electrons are ignored.

Expressed in:- grams or any other units to measure weight.

Standard:- 1/12th of mass of a C-12 isotope.

In case of H, He , LI , Be , B , C , N , O , F , Ne , Na , Mg , Al , Si , P, S , Cl, Ar , K , and Ca except Li , Be, B, F, Na , Al , P, Cl , K and Ar,

atomic mass= double the atomic number

Here are some of the elements and their atomic mass-