In the formation of compound between two atoms $A$ and $B$ , $A$ looses two electrons and $B$ gain one electron.
(a) What is the nature of bond between $A$ and $B$ ?
(b) Explain the formation of $M g C l_{2}$ molecule.
(c) Common salt conducts electricity only in the molten state. Why?
(d) Why is melting point of $N a C l$ high?

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Solution

(a) Since the bond formation involves loss and gain of electrons, the bond formed must be ionic.
(b) Formation of $M g C l_{2}$ molecule:
$M g \to M g^{2 +} + 2 e^{-}$
$2 C l + 2 e^{-} \to 2 C l^{-}$
$∴ M g^{2 +} + 2 C l^{-} \to M g C l_{2}$
(c) When $N a C l$ is melted, the ions become mobile. Due to this they can conduct electricity.
(d) Due to strong electrostatic interactions between the ions $N a^{+}$ & $C l^{-}$ , more energy is required to break this interaction. Hence, due to this it has high melting point.

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Element X reacts with element Y to form a compound. Z. During the formation of compound Z, atoms of X lose one electron each whereas atoms of Y gain one electron each. Which of the following property is not shown by compound Z?
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