Home Module Mass Number

Mass Number


An atom consists of three subatomic particles namely: electrons, protons and neutrons. The mass number of an atom is the sum of the number of protons and the number of neutrons in the nucleus.

Learning objectives

After completing this module, you will be able to:
- Define mass number.
- Identify the mass number of the first 20 elements in the periodic table.
- Calculate the mass number of any element.

Keywords Atom , Periodi Table Of Elements , Bohr's Atomic Model
Controller Required Yes
Languages English - US , English - UK , 中文 , عربي , Français
Domain K-12
Topic Code MS200296
Devices Google Cardboard , Google Daydream , Samsung Gear VR , Oculus Go , Pico , EduPro