The order of decreasing atomic size is:

Out of $Li$ and $K$,which will have stronger metallic character and why?

Justify the following statements:
$(a)$ Cations are smaller in size than the corresponding neutral atom.
$(b)$ The size of the atom increases as we move down a group.
$(c)$ Atomic size decreases as we move across a period.

The atomic numbers of three elements $A, B$,and $C$ are $12, 18$,and $20$ respectively. State,giving reason,which two elements will show similar properties.

Which one of the following elements exhibits the maximum number of valence electrons?

Describe the basic character of the oxides of third period elements across the period from left to right.