16. FALSE
17. TRUE
18. FALSE
19. TRUE
20. TRUE
Atomic mass!!! the electrons and atomic mass will always be the same most the time
It's either B or D because there would be 2 coefficients of hydrogen and one of oxygen
The answer is (2) 2 pairs. The oxygen atoms combine to get stable structure. So after the combination, each atom needs to have 8 electrons. So when they share 4 electrons can satisfy this requirement. Then there are 2 pairs shared.
