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The fundamental particles present in equal numbers in neutral atoms are

  • A.Protons and electrons
  • B.Neutrons and electrons
  • C.Protons and neutrons
  • D.Protons and positrons

Answer: A

Protons and electrons are equal in number in a neutral atom.

The proton carries \(+1.6\times10^{-19}\ \mathrm{C}\) and the electron exactly the opposite, so equal numbers make the atom electrically neutral. The neutron count varies between isotopes and need not match either.

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