Give reasons why the ground state outermost electronic configuration of silicon is:

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

On Mulliken scale, the average of ionization potential and electron affinity is known as _____.

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