The number of protons is what defines the element. Oxygen, for example, has eight protons. However, the number of neutrons in ...

An element is a substance that is made up of only one kind of atom. The atoms in a particular ... and all the noble gases of Group 0, helium, He, neon, Ne, argon, Ar, krypton, Kr, xenon, Xe ...

Players read questions about energy levels and score points by picking the correct element as the answer ... energy level and six electrons on the second energy level. Since this atom has a total of ...