Question

The elements of groups,1, 2, 13, 14, 15, 16 and 17 are collectively called

• A. Noble gases
• B. Representative or normal elements
• C. Transition elements
• D. Inner transition elements

Answer 1

The correct option is B Representative or normal elements

In the modern periodic table, elements are classified into representative elements, transition elements, inner transition, inner gases based on electronic configuration.

When the group number of the elements represents the number of valence electrons they are called representative elements.

Group - 1 (1A) - 1 valence electrons

2 (IIA) - 2 valence electrons

3 (IIIA) - 3 valence electrons

4 (IVA) - 4 valence electrons

15 (VA) - 5 valence electrons

16 (VIA) - 6 valance electrons

17 (VIIA) - 7 valence electrons