Their weights could be different.
Their volumes could be different.
Their densities could be different.
The volume for an ounce of lead is much different than an ounce of aluminum.
the weight of a cubic meter of balsa wood is much different (and much lighter) than a cubic meter of water. That's why the ancients used balsa for their rafts.
It would be solid because you said it dissolves...Hope this helped :)
In the process of either gaining or losing negatively charged electrons the reacting atoms form ions.
