Question

The elements given below are arranged in order of increasing atomic masses.
F, Na, Mg, Al, Si, P, S, Cl, Ar, K
(i) Pick two sets of elements which shows similar behaviour
(ii) This arrangements of elements is an illustrator of which law of classification of elements.

Answer 1

I) a. Na and K

b. F and Cl

The elements present in the same group of the period table show similar properties.

Na and Mg belong to the first group of the periodic table and the group is called alkali metals.

F and Cl belong to the 17th group of the periodic table and the group is called halogens.

II) The law that arranges of elements according to increasing atomic masses was given by Dmitri Mendeleev .

The law states that , "The properties of element are the periodic function of their atomic masses".