Question

An atom has mass number 23 and atomic number 11. The atom has ___ electrons.

Answer 1

1. The atomic mass number denotes the total number of neutrons and protons present in the atom.
2. $\mathrm{Mass}\mathrm{number}=\mathrm{Number}\mathrm{of}\mathrm{protons}+\mathrm{Number}\mathrm{of}\mathrm{neutrons}.$
3. The atomic number represents the number of electrons/protons in the atom. In a neutral atom, it is also equal to the number of protons.
4. $\mathrm{Atomic}\mathrm{number}=\mathrm{Number}\mathrm{of}\mathrm{protons}=\mathrm{Number}\mathrm{of}\mathrm{electrons}.$
5. In the given atom, the atomic number is 11. Therefore, it has 11 electrons and 11 protons.