The sum of the protons and neutrons in an atom equals to the mass number.
What is Atom?
An atom is the smallest unit of ordinary matter that forms a chemical element. Every atom is composed of a nucleus and one or more electrons bound to the nucleus. The nucleus is made of one or more protons and a number of neutrons.
What is Proton?
A proton is a stable subatomic particle, symbol p , H⁺, or ¹H⁺ with a positive electric charge of +1e elementary charge.
What is electron?
The electron is a subatomic particle whose electric charge is negative one elementary charge.
What is Neutron?
The neutron is a subatomic particle, symbol n or n⁰ , which has a neutral charge, and a mass slightly greater than that of a proton.
What is Mass Number?
The mass number of the atom (M) is equal to the sum of the number of protons and neutrons in the nucleus. The number of neutrons is equal to the difference between the mass number of the atom (M) and the atomic number (Z).
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