Which of the following statements is incorrec | vedclass

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(D) $1$. Sodium is the $6^{th}$ most abundant element in the Earth's crust,but it is not the most abundant metal (Aluminum is). Thus,statement $A$ is

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The ionic character of alkali metal halides decreases down the group.

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(D) $1$. Sodium is the $6^{th}$ most abundant element in the Earth's crust,but it is not the most abundant metal (Aluminum is). Thus,statement $A$ is correct.$2$. Sodium is indeed the most abundant metal in seawater (as $NaCl$). Thus,statement $B$ is correct.$3$. Melting points of alkali metals decrease down the group due to weaker metallic bonding as atomic size increases. Thus,statement $C$ is correct.$4$. According to Fajan's rule,as the size of the cation increases down the group,the polarizing power decreases,which increases the ionic character of the halides. Therefore,the ionic character increases down the group,making statement $D$ incorrect.

Which of the following statements is incorrect?

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