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

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

NTA AbhyasNTA Abhyas 2020Classification of Elements and Periodicity in Properties

Solution:

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.
Solution