EVERYDAY SCIENCE

Detailed explanation-1: -Summary. The vertical columns on the periodic table are called groups or families because of their similar chemical behavior. All the members of a family of elements have the same number of valence electrons and similar chemical properties. The horizontal rows on the periodic table are called periods.

Detailed explanation-2: -The vertical columns (groups) of the periodic table are arranged such that all its elements have the same number of valence electrons. All elements within a certain group thus share similar properties.

Detailed explanation-3: -Vertical columns in the periodic table starting from top to bottom are called groups. There are 18 groups in the modern periodic table. The elements of same group have same number of valence electrons.

Detailed explanation-4: -The elements in the same column of the periodic table are all part of the same chemical family or group. Each member of the chemical family has the same number of valence electrons. Valence electrons are those electrons located in the outer orbital.

Detailed explanation-5: -The vertical columns are known as groups and the horizontal rows are known as periods.