I've heard water called a "universal solvent." Everything, the story goes, dissolves in water -- even if it's only very, very, slightly. Dunno if that's what you've heard, and where you're going with it, but yeah, the alkali and alkaline earth metals that "dissolve" in water really react to form something else which in turn actually dissolves in water. Like astrokel: says, metal atoms don't function as hydrogen bond donors or acceptors, don't have a significant dipole, etc., so they don't dissolve in water.