Question

QII) What do you mean by Periods and Groups of the periodic table?​

Answer 1

Explanation:

periods: Horizontal rows in the periodic table are called period. Their are 7periods in periodic table.

Groups: Vertical columns of periodic table are called groups. They are 18in number.

Hope it would be helpful:)

Answer 2

●Groups and periods are two ways of categorizing elements in the periodic table.

● Periods are horizontal rows (across) the periodic table, while groups are vertical columns (down) the table.

●Atomic number increases as you move down a group or across a period.