They are products of the reaction.
Answer:
28
Explanation:
electron = atomic number - charge(if the charge is positive and addition if the charge is negative)
electron = 30 - 2
electron = 28
I heard of this before I think I know the answers.
1st one, I'm thinking D. Because Turning Liquid into a Solid means like it would take energy out since its freezing.
2nd one, I would choose A
B and C why would they slow down if they were still in a solid. they attracted one another, but they stood still(Didn't move). D is explaining how Liquid turns into a Solid, so this is definitely incorrect. So I would choose A.
I really do hope this helps you out. (Idk about the 1st, but 2nd I think its the answer)
Mass number is the sum of protons and neutrons inside an atom.
Atomic mass = no. of protons + no. of neutrons