⇒ On moving left to right in a period IE increases and from top to bottom in a group IE decreases.

F > P > S > B (IE order)

⇒ On moving left to right in a period metallic and basic character decreases.

K > Mg > Al > B (Metallic character order)

⇒ On moving top to bottom in a group metallic and basic character increases.

${\mathrm{K}}_2\mathrm{O}>{\mathrm{Na}}_2\mathrm{O}>\mathrm{MgO}>{\mathrm{Al}}_2{\mathrm{O}}_3$

⇒ EA : Group 17 > Group 16 > Group 15

Cl > F > S > P