solution:
answer is two
explanation:
In sharing of electrons in the equation water each carbon atom and hydrogen atom share its one electron from its outermost orbit.
since carbon has seven electrons in its outermost orbit and it wants to get one electron to complete its octet.
while hydrogen atoms has one electron to its outermost orbit and it needs one electron to complete its duet.
similarly
second hydrogen atom do as the shame process as it also share one electron to carbon to complete its duet.
after the sharing of electrons both the atoms form molecule water which is stable.
