Question

In the first two groups of periodic table, the group number represents the :

• A. Valency
• B. Atomic weight
• C. Atomic number
• D. Electronegativity

Answer 1

The correct option is A Valency

The Group number in the first two groups of the periodic table represents the valency of a particular element.

i.e. it represents the number of valence electrons in their outermost shell.

For e.g. All Group - I elements have 1 valence electron in their outermost shell and Group - II elements have 2 electrons in their outermost shell.