Just add up all the "exponents" and you'll get 25 which is Manganese or Mn on the periodic table!
I believe c. I hope it helps :)
It is purely called the Atomic Mass
Answer:
Electric engines have efficiencies of roughly 90% whilst combustion engines about 10% to 30%. This is because combustion engines emit much more heat, which is always energy that is not used as work, and thus increases inefficiency.
Explanation:
