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Neutrons and protons contribute to an atom's mass number because an atom's mass number is the number of protons plus the number of neutrons. 

The subatomic particles contribute to an atom’s mass number but not its atomic number is neutrons.

Explanation:

  • Atom is defined as the smallest unit of a matter.
  • Atom is made up of three subatomic particles: protons, electrons, and neutrons.
  • The whole mass of an atom is concentrated in its center which is named the nucleus of an atom
  • Protons and neutrons are collectively known as nucleons.
  • The mass of the atom is given by:

            = Number of protons + Number of neutrons

  • The atomic number of an atom is equal to the number of protons in an atom.

So, from this, we can conclude that subatomic particles contribute to an atom’s mass number but not its atomic number is neutrons.

Learn more about atomic mass and atomic number here:

brainly.com/question/2099804?referrer=searchResults

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