A compound
its refers to a substance formed when two or more types of atoms bond chemically
I can't answer it if I can't see the image.
A hydrogen atom is an atom of the chemical element hydrogen. The electrically neutral atom contains a single positively charged proton and a single negatively charged electron bound to the nucleus by the Coulomb force. Atomic hydrogen constitutes about 75% of the baryonic mass of the universe.
Anatomy I think it's important to know anatomy as a young adult so u are self aware of your body
If you are asking for the formula, here it is. \
10x+5>12x-1