Question

In graph of atomic volume versus atomic weight, the elements corresponding to peaks in the curve belong to

• A. Group 1
• B. Group 18
• C. Group 4
• D. Group 14

Answer 1

Answer: (A)

If we see the atomic mass versus atomic volume curve, we will notice the following features:

• Alkali metals such as $\text{Na,} \, \text{K,} \, \text{Rb}$ which have similar properties occur as peaks of the curve.
• Halogen elements like $\text{F,} \, \text{Cl,} \, \text{Br,}$ which have similar properties occur at the rising or the ascending part of the curve.
• Noble gases such as $\text{Ne,} \, \text{Ar,} \, \text{Kr}$ which have similar properties occur just before the alkali elements.
• Hydrogen and Helium seem to be exception to the rule.