How does Hydrogen combine with other elements?
Hydrogen has one electron in its outer shell, which needs to have two. So it combine with the other elements in three ways (1) It can accept one electron to form hydrides (that is what it do with electropositive elements like Na, K, Ca, Mg, Al etc) (2) It can share one electron to form covalent bonds (that is what it do with elements of comparable electronegativity such as Carbon) (3) It can give its one electron to form Hydronium Ion (that is what it do with electronegative elements such as F, Cl, Br, I etc) I hope this is what you were looking for.
