CLASS XII CHEMISTRY

GROUPS

The vertical columns in the periodic table are called Groups.Groups have been divided into subgroups A and B.

Subgroup A (IA-VIIIA) expresses the representative elements while B shows Transaction elements.

S - BLOCK ELEMENTS :

The elements of groups IA and IIA are called s-block elements.These have a valence shell configuration.These elements are lighter and soft metals and act as good reducing agents.

P-BLOCK ELEMENTS:

Those elements in which the last electron occupies "p" orbital are called p-block elements of the periodic table.The elements of IIIA to VIIIA (six groups) are p-block elements.

ALKALI METALS:

Elements of group IA are called Alkali metals because they are highly soluble in water.