Question

Which prediction(s) is/are incorrect according to the Lother Meyer's curve?

• A. Each peak of the curve is occupied by the alkali metals
• B. Alkaline earth metals occupy ascending positions of curve
• C. Atomic volume increases first and then decreases in a period (which is defined later) in Lother Meyer's curve
• D. Identically placed elements in the atomic volume vs atomic mass curve occur in the same period in the periodic table

Answer 1

Answer: (B), (C), (D)

The correct options are
B Alkaline earth metals occupy ascending positions of curve
C Atomic volume increases first and then decreases in a period (which is defined later) in Lother Meyer's curve
D Identically placed elements in the atomic volume vs atomic mass curve occur in the same period in the periodic table

Lothar Meyer - Meyers Curve:

1.Plotted the atomic volumes of the elements against the atomic weight, and found that the chemical properties of the element recur periodically.

2.Also notice that the elements occupying the corresponding position of the curve show similar chemical properties.

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

i)Alkali metals such as $Na,K,Rb$ which have similar properties occur as peaks of the curve.

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.

So option A is correct, B,C & D are incorrect.

Hence options B,C & D are correct.