Arrange the following in:
Decreasing ionic size:
Mg²⁺, O^2-, Na⁺, F^-

Arrange the following in:
Increasing first ionisation potential :
Mg, Al, Si, Na

Arrange the following in:
Increasing acidic property:
ZnO, Na₂O₂, P₂O₅, MgO

All molecules with polar bonds have dipole moment.