Boron or aluminum which element is metal? a semi metal? and what single property best explains the difference in their reactivity?

Boron or aluminum which element is metal? a semi metal? and what singl

1.	Boron or aluminum which element is metal? a semi metal? and what single property best explains the difference in their reactivity?
Answer» The usual oxidation state of boron and ALUMINUM is +3, WHEREAS the heavier ELEMENTS in group 13 have an INCREASING tendency to form COMPOUNDS in the +1 oxidation state.