Question

Which compound has a higher magnitude lattice energy nacl or mgcl2?

Answer 1

U(MgCl2) = 2477; U(NaCl) = 769 kJ mol^-1 ... Higher lattice energy implies better stability meaning stronger bonds.

Answer 2

NaCl is the compound which has higher magnitude lattice energy than $MgCl_{2}$.

Explanation:

• Lattice energy is defined as the energy released when formation of 1 mole of an ionic compound occurs due to the combination of its constituent ions. Hence, more is the magnitude of lattice energy more will be the stability of the ionic compound.

• Atomic number of sodium is 11 and its electronic distribution is 2, 8, 1. Hence, to attain stability it will readily lose an electron. Therefore, it will form $Na^{+}$ ion.

• Whereas atomic number of magnesium is 12 and its electronic distribution is 2, 8, 2. Hence, to attain stability it requires lose two electrons. Therefore, it will form $Mg^{2+}$ ion. But losing one electron is much easier than losing two electrons.

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