Answer:
A.it is converted into thermal energy
B is the answer. For an equation to be balanced there must be the same amount of each element on the two sides. The only one where this is the case is B.
It would have 11 valance electrons.
Example/Explanation:
Say we are talking about groups 10. Group 10 would have 10 valance electrons because of the atom's electronic arrangement in the periodic table.
Answer: it’s number 2 add a catalyst
Hopefully this helped :)