SSC MTS EXAM

Detailed explanation-1: -Summary. The vertical columns on the periodic table are called groups or families because of their similar chemical behavior.

Detailed explanation-2: -Assertion: Elements in the same column have similar properties. Reason: Periodic properties of elements is a function of atomic number. Both assertion and reason are true and reason is the correct explanation of assertion.

Detailed explanation-3: -The periodic table is composed of vertical columns called groups and horizontal rows called periods.

Detailed explanation-4: -The vertical columns in the modern periodic table are known as groups and the horizontal rows are known as periods. There are 7 periods and 18 groups in the modern periodic table.