The positions of three elements A, B and C in the periodic table are shown below :
(a) State whether A is a metal or non-metal.
Group 16Group 17

(b) State whether C is more reactive or less reactive than A.
(c) Will C be larger or smaller in size than B?
(d) Which type of ion

AcademicChemistryNCERTClass 10

(a) As the valency of group 17 elements is 1 and all these elements accept electrons, hence, A is a non-metal.

(b) C is less reactive than A because as we move down in a group, the reactivity of non-metals increases.

(c) C is smaller in size than B because both B and C are related to the same period and the size decreases as one moves from left to right in a period.

(d) A will form an anion because it is a non-metal.

[Extra information: 

Periodic table: A periodic table is a tabular display of all the chemical elements that are arranged by the order of their atomic number, electronic configuration, and recurring chemical properties. 

It displays the names, atomic numbers, symbols and atomic weights of known elements. It serves as a great tool for solving chemistry problems.

The periodic table is important because it is organized to provide a great deal of information about elements and how they relate to one another in one reference. The table can be used to predict the properties of all the elements, even those that have not yet been discovered.]

Updated on 10-Oct-2022 13:19:17