A catalyst is a substance that speeds up a chemical reaction.
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!! :)
hydrogen is the lightest element in the periodic table
the answer is a chemical element
Positive ion with a radius smaller than the radius of the atom
