Question
Question: Iron is harder than sodium because :...
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.
Answer
Metallic bonds are stronger in iron.
Explanation
Solution
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.