Chemistry Chemical Bonding and Molecular Structure Types of Bonding and Forces in Solid Single Correct MCQ
Published on: August 11, 2026

Iron is harder than sodium because :

A
Iron atoms are smaller.
B
Iron atoms are more closely packed.
C
Metallic bonds are stronger in sodium.
D
Metallic bonds are stronger in iron.

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Verified by Experts
The correct answer is:
D

The strength of metallic bonds depends upon the number of mobile electron(s) per atom. Sodium has only one mobile electron per atom where as iron has 8 mobile electrons per atom.

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