Pretty much everything I remember from my high school chemistry class can be summed up in two paragraphs:
An atom can’t have more than eight electrons at a single energy state. Sharing electrons (up to eight of them) is what allows groups of atoms to form molecules. Or maybe it’s only six electrons. That gives oxygen (which has eight of them) two “extras” that it can share with passing hydrogen atoms, thus allowing water to stay stuck together, so yeah, it’s probably six. (Either way, when you consider how long it’s been since that chemistry class, I’m amazed I remember that much detail.)
Also, if you plan to mix sodium and water, you should wear safety glasses. Ditto for mixing potassium and water. Oil and water don’t mix at all, but if you mix oil and vinegar you end up with salad dressing. (That’s what I’m told anyhow; I usually go for honey mustard instead.)