Question

arrange the following according to the increasing order of covalence NaF, Nacl, NaBr, Nal​

Answer 1

Answer:

NaI<NaBr<NaCl<NaF

Explanation:

In other words The energy used to decompose the ionic solid into its constituent cation and anion is called lattice energy.

For example, in the formation of sodium chloride from sodium ion and chloride ion in gaseous state, 787.3 kj/mol of energy gets released, which is known as the lattice energy of sodium chloride.

The same amount of energy will be used in the decomposition of this ionic solid into its constituent ions.

Overall as we go down in a group, ionic radius increases and lattice energy decrease. However, in a period from left to right as the charge on ion increases, lattice energy increases.

Lattice energy ∝ Charge on ion/size of the ion

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Answer 2

Answer:

NaF<NaCl<NaBr<NaI

Explanation:

Fajan's rule states that the covalence of a compound increases if:

The cation gets smaller.

The anion gets bigger.

Here, the cation is having a constant size (), hence we will look at the size of anion. Arranging according to sizes gives the answer given

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