How the atomic size vary in a group and across a period? Explain with suitable example.

Give reason: Alkali metals have low ionization energy.

Give reason: Inert gases have exceptionally high ionization potential.

Give reason: Fluorine has less electron affinity than chlorine.

Give reason: Noble gases possess relatively large atomic size.

Consider the oxides ${\mathrm{Li}}_2\mathrm{O}, {\mathrm{CO}}_2, {\mathrm{B}}_2{\mathrm{O}}_3$ : Which oxide would you expect to be the most basic?

Consider the oxides ${\mathrm{Li}}_2\mathrm{O},{\mathrm{CO}}_2,{\mathrm{B}}_2{\mathrm{O}}_3$ - Which oxide is most acidic?

Consider the compound ${\mathrm{Li}}_2\mathrm{O},{\mathrm{CO}}_2,{\mathrm{B}}_2{\mathrm{O}}_3$ - Give the formula of an amphoteric oxide.