write the names of the subatomic particles
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The three main subatomic particles that form an atom are protons, neutrons, and electrons. The center of the atom is called the nucleus.
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Sub atomic particles are majorly proton ( positive unit charge ), electron ( negative unit charge ) and neutron ( no charge ). Proton and neutron have similar mass and electron has negligible mass.
Thus, the atomic number( Z )= number of electrons or protons present in the atom( both are in equal number in atom )
mass number( A )= mass of protons + mass of neutrons
[ NOTE: There are other sub atomic particles such as positron, neutrino, anti neutrino etc. but the main particles are the ones mentioned above. ]
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