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