Question

The elements in groups 1a through 7a are

Answer 1

1A alkali metals

2A alkali earth metals

3B-2B transition metals

7A halogens

8A noble gases

Answer 2

The elements in groups 1a through 7a are called d. representative elements. The periodic table is organized according to increasing order of the atomic number of the elements. Groups have similar properties while the period of the elements determines the valence electrons in the outer shells.