Hi :)
The bottom number tells you how many protons you have in the nucleus of this element.
In Krypton-84, this means that you have 84 nucleons, where 36 of these are protons, and the remaining 48 are neutrons.
Hope this helps :)
I feel like it is important, because it is always nice to learn about new things and keep your mind open, to expand your knowledge.
I think the answer is -2 which is answer A
Answer: In a chemical equation the reactants are located on the left side and the products are located on the right side.
