Lothar Meyer plotted a graph between the atomic volumes and atomic weights of the elements and observed that the elements with similar properties occupied similar positions on the curve. The elements_______________are the most reactive.

Options

A. at the peaks
B. at the troughs
C. occupying the descending positions on the curve
D. occupying the ascending position on the curve

Answer

A

Explanation

The most electropositive alkali metals `(Li, Na, K,etc.)` occupy the peaks on the curve and can be considered to from a group by themselves.
The less strongly electropositive alkaline earth metals `(Be, Mg, Ca, etc.)` occupy the descneding positions on the curve. The most electronegative elements, i.e., halogens `(F, CI, Br, etc.)` occupy the ascending protions on the curve. The elements in the troughs (noble metals ) are characreristically more inert.