Four atoms of hydrogen combine with one carbon atom to form ch4, but only two hydrogen atoms combine with one oxygen atom to form h2o. why?

Hydrogen has one valence electron, Atoms may share electrons in order to fill their electron shells, Oxygen has two vacancies in its electron shell, but carbon has four vacancies.

Explanation:

i jus did it on study island :P

< > according to newton's third law of motion, forces always act in equal but opposite pairs. another way of saying this is for every action, there is an equal but opposite reaction.< >