Question

How many periods and groups are present in the periodic table?

• A. 7 periods and 18 groups
• B. 8 periods and 7 groups
• C. 7 periods and 7 groups
• D. 8 periods and 18 groups

Answer 1

Answer:

A. 7 periods and 18 groups

Modern periodic table:

• The modern periodic table was put forward by Henry Moseley. Hence, he is known as the father of the modern periodic table.

• In the modern periodic table, elements are arranged according to their increasing atomic numbers.

Groups:

• Vertical columns are called groups.

• Elements are arranged into 18 groups.

Periods:

• Horizontal lines are called periods

• Elements are arranged in 7 periods.