Answer:
PRESSURE is right answer .
Explanation:
Blank 1: nothing (to keep 2 total nitrogen)
blank 2: 3 (to make 6 total hydrogen)
blank 3: 2 (to make 2 total nitrogen and 6 total hydrogen)
hope this helps!! :)
Because metals that are more reactive than carbon wont react with it.
....oxygen and sulfur this is cuz of the potential energy there in the same properties