Question

alkal metals belongs to 1A group have a mettalic properties in an increasing order in group from top to bottom support with proper information?​

Answer 1

As we go down a group,

i) Effective nuclear charge increases,

ii) Atomic size or radius also increases.

From this we can say that the atoms of element at the top level of a group exert more control over its valence electron. so as we go down a group the valence electron go faraway from the nucleus of the elements.

As a result the tendency to loss electron increases. That is the metallic character of element increases as we go down a group.

Ex. Na belonging to 1st group at 3rd period has less metallic property than K belonging to 4th period.