Show diagrammatically the electron distributions in a sodium atom and a sodium ion and also give their atomic number.

AcademicChemistryNCERTClass 9

The atomic number (Z) of an element is equal to the number of protons in its atom.

Atomic No. of Na = 11, it has 11 protons.

The number of electrons = number of protons = 11.

Electronic distribution (Na) = 2,81.

A positively charged sodium ion (Na+) is formed by the removal of one electron from a sodium atom. So, a sodium ion has 11 – 1 = 10 electrons.

Electronic distribution (Na+) = 2,8.

Since the sodium atom and the sodium ion contain the same number of protons, the atomic number of the sodium atom as well as the sodium ion is 11.

Updated on 10-Oct-2022 13:32:35