science
Grade-9
Easy
Question
The number of protons and neutrons combining in an atom is called
- Atomic number
- Mass number
- Electronic configuration
- Valence shell
Hint:
The number of protons and neutrons are combined together called the mass number.
The correct answer is: Mass number
- The total number of protons and neutrons is called as mass number of an atom.
- It is also called an atomic mass number or nucleon number.
- The protons and neutrons together are called nucleons.
- So the mass number can be described as the sum of protons and neutrons in the nucleus of an atom.
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