Atoms are neutral Particles they have no charge.
The total no. of Protons and neutrons in an atom is called the mass no.
The no. of protons or electrons in an atom = atomic no.
Isotopes = elements which contain the same no. of protons but a different no. of neutrons.
238 - mass no.
U
92 - atomic no. = 92 protons, 146 neutrons
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