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The mass number of an atom is determined by

Options

  1. Aadding the number of neutrons and number of electrons
  2. Badding the number of protons and number of electrons
  3. Cthe number of protons only
  4. Dadding the number of neutrons and number of protons

Correct answer

D. adding the number of neutrons and number of protons

Step-by-step solution

Mass number (A)= Number of protons (p)+ Number of neutrons ( n ) .

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