Solution:
The answer is (c) It has 18 vertical columns known as Groups
Explanation: The modern periodic table is divided into 18 groups and seven periods. Columns are referred to as groups, while rows are referred to as periods.
Solution:
The answer is (c) It has 18 vertical columns known as Groups
Explanation: The modern periodic table is divided into 18 groups and seven periods. Columns are referred to as groups, while rows are referred to as periods.