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Question

In the Lothar - Mayer graph, the elements on the points A, B, C, D & E respectivley are:

A
Halogens
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B
Alkaline earth metals
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C
Alkali metals
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D
Transition elements
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Solution

The correct option is C Alkali metals
Most electropositive alkali metals occupy the peaks of the curve.

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

i) Alkali metals such as Na, K, Rb which have similar properties occur at peaks of the curve. He didn't mention alkaline earth metals.

ii) Halogen elements like F, Cl, Br which have similar properties occur at the rising or the ascending part of the curve.

iii) Noble gasses such as Ne, Ar, Kr which have similar properties occur just before the alkali elements.

iv) The atomic volume of the elements in a period initially decreases and then increases.

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