Question

What is meant in the periodic table by, (a) a group, and(b) a period ​

Answer 1

Answer:

The periodic table is an arrangement of the elements in order of their atomic numbers so that elements with similar properties appear in the same vertical column or group. ... A period is a horizontal row of the periodic table.

Answer 2

Answer:

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

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

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

(c) (i) Group1: Lithium and Sodium.

(ii) Group 17: Fluorine and Chlorine.

(iii) Group 18: Neon and Argon.

Explanation:

hope it is clear to u