Describe briefly the important properties of aluminum and its alloys.
I guess this depends exactly what you're looking for.
From a structural engineer's perspective, the two important properties are yield stress and modulus of elasticity.
I could see other engineers caring about toughness, hardness, ductility,........
from a mechanical engineer stand point
I can't really comment on that.
no problem, toughness, hardness, ductility sounds about right