Question

In the atom of an element ‘Z’, 5 electrons are present in the outermost shell . It requires noble gas configuration by accepting requisite number of electrons, then what would be the charge on the ion so formed? Write the formula of the compound which will be formed when ‘Z’ reacts with Na atom.

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Answer

Number of electrons in the outermost shell = 5

Number of electrons required to make noble gas configuration = 8 – 5 = 3

The charge on the ion so formed = Z + 3e

= Z3-

The valency of Z = 3

Chemical formula of the compound:

The valency of Z 3

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