Ice is lighter and floats in water because it is a crystalline structure in which each water molecule is bonded to a maximum of four other water molecules by which kind of bond?

An atom of sodium-23 (atomic number = 11) has a positive charge of +1. give this information, how many electrons does it have? how many proteins and neutrons does this atom have

At 300 mm hg, a gas has a volume of 380 l, what is the volume at standard pressure

Which compound contain an iron with a 3+ charge