Iron is hard than sodium because

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Metallic bonds are stronger in iron

None of the above

Iron atoms are more closely packed

Iron atom is smaller

answer is C.

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Detailed Solution

Iron is hard than sodium because there is a strong metallic bond in iron than sodium. This is because iron (Fe) has more number of valence electrons and greater nucleus charge than sodium (Na).

The atomic number of iron, Z = 26.

The atomic number of sodium, Z = 11.

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