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We talked about symbols of elements in the previous module. For example, N was the symbol for Nitrogen.

If we want to denote the atomic and mass number, we write it as shown in the figure. So, \(7\) is the atomic number, and \(14\) is the mass number.
How many protons, electrons and neutrons does \(^{26}_{12} X\) have? Just to recap, atomic number is the number of protons; mass number is the number of protons plus the number of neutrons.
  • Protons: 26, Neutrons: 12
  • Protons: 12, Neutrons: 26
  • Protons: 12, Neutrons: 14
  • Protons: 12, Neutrons: 12