Question

arrange the following in decreasing order of their ionic characters of the bond and give reason Naf, NaBr,NaCl,Nal​

Answer 1

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NaF > NaBr > NaCl > NaI

Explanation :-

According to Fajan's rule ,

• Larger the size of cation the smaller the size of the anion ,and the more will be the ionic character

Now Looking into the given examples ,

NaBr , NaCl , NaI and NaF

There is a common cation i.e , Na. Now coming to the anions there are Flourine , chlorine , Bromine and Iodine. The given anions belong to the same group in the periodic table (VIIA) . On moving from top to botton in a group the atomic size increases. This mean (Size of Flourine) < (Size of chlorine) < (size of bromine) < (Size of Iodine). Now applying the Fajan's rule here , the final order we get is ,

NaF > NaBr > NaCl > NaI

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More About Fajan's Rules :

✤ Polarizing Power :

The ability of a cation to attract an anion is known as polarising the power. The more the charge on the cation , the more will be the Polarising power.

✤ Polarizability :

The ability of an anion to get distorted to the cation is known as polarizability.