EVERYDAY SCIENCE

Detailed explanation-1: -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. 05-Jun-2019

Detailed explanation-2: -Elements present in the same group have the same number of valence electrons. Therefore, elements present in the same group have similar physical and chemical properties.

Detailed explanation-3: -The elements in each group have the same number of valence electrons. As a result, elements in the same group often display similar properties and reactivity.

Detailed explanation-4: -Elements in the same group have same outer shell configuration, hence the number of valence electrons is same and thus the valency.

Detailed explanation-5: -Elements in a group have the same physical and chemical properties because their atoms have the same number of valence electrons or same valence shell electronic configuration.