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.