Question

define valency. explain the formation of sodium chloride​

Answer 1

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✌VALENCY

Valency is the combining power of an element. Elements in the same group of the periodic table have the same valency. The valency of an element is related to how many electrons are in the outer shell.

✌Formation of sodium chloride

Na is in excess of one electron to attain octet configuration.

Cl has one electron less to attain octet configuration.

So, the excess one electron is transferred to a chlorine atom from Na(sodium) atom and thus an ionic bond is formed due to the transfer of electrons. Chloride being a mole electronegative atom than sodium tends to attract the shared electron pair towards itself.

Thus NaCl has Na +and Cl − atoms.

Na+ CL-

Chloride attains octet configuration by gaining on the electron.

Sodium attains octet configuration by losing the electron.

Thus Ionic solid NaCl is stable.

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Answer 2

In chemistry, the valence or valency of an element is the measure of its combining capacity with other atoms when it forms chemical compounds or molecules.

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