(a) What is meant by (i) a group, and (ii) a period, in a periodic tab

1.	(a) What is meant by (i) a group, and (ii) a period, in a periodic table ?(b) How many periods and groups are there in the long form of periodic table ?(c) Give two examples each of (i) group 1 elements (ii) group 17 elements (iii) group 18 elements.
Answer» (a)(i) The vertical columns in a periodic table are called groups. (ii) The horizontal rows of elements in a periodic table are called periods. (b) There are seven periods and eighteen groups in the long form of periodic table. (c)(i) Group 1: Lithium and Sodium. (ii) Group 17: Fluorine and Chlorine. (iii) Group 18: Neon and Argon.

(a) What is meant by (i) a group, and (ii) a period, in a periodic table ?(b) How many periods and groups are there in the long form of periodic table ?(c) Give two examples each of (i) group 1 elements (ii) group 17 elements (iii) group 18 elements.

Answer»

(a)(i) The vertical columns in a periodic table are called groups.

(ii) The horizontal rows of elements in a periodic table are called periods.

(b) There are seven periods and eighteen groups in the long form of periodic table.

(c)(i) Group 1: Lithium and Sodium.

(ii) Group 17: Fluorine and Chlorine.

(iii) Group 18: Neon and Argon.