If the gun wasn't loaded is it still considered armed robbery ?

Yes. The gun is being used as a threat for the robbery.

If you had a plastic gun that looked like a real gun and you robbed some people it would still be considered armed robbery. So yes if a real gun isn't loaded it's armed robbery forsure.

Yes. If it's not known by the victim, they would righfully fear it's a real gun.

People have been convicted of armed robbery just for having their hand in their pocket and making threatening moves with that hand!
So it doesn't even take a gun- just an implied presence of a gun by hand movements!

Yes, it's still considered armed robbery, whether the gun was loaded or not is of no consequence. People assume the gun is loaded and capable of inflicting harm.

yes, anytime you use a weapon, even a fake 1, it is armed robbery

yep

Yes.

Look up the term "pistol whipped".
It's still a weapon, in addition to the perceived threat.