'No matter what element they are in, they weigh the same & their total is an element's atomic number'
protons
UP & ATOM: No matter what element they are in, they weigh the same & their total is an elements atomic number
No matter what element they are in, they weigh the same & their total is an element's atomic number
No matter what element they are in, they weigh the same & their total is an element's atomic number
UP & ATOM
protons
UP & ATOM