Henry Mosely
increasing Proton number.
Proton number
The proton number is the atomic number.
Proton number is called atomic number when referring to periodic table. Proton number is equal to atomic number.
some atoms are heavier than others as they have higher relative Atomic Mass, by which is equals to proton number + number of neutrons in an atom, according to the Periodic Table of the elements
Elements are scientificaly organised according to their Proton numbers. Those with smaller proton numbers come first.
You need to clarify this question. Do you mean, "How is the number of protons determined in the periodic table of the elements?"
Iodine has 53 protons.
Helium, number two on the periodic table of elements. Nothing else has two protons, for to remove a proton or add a proton is to change the element.
Elements are listed by the number of protons they contain starting with Hydrogen which has one proton.
Elements as H, He, Li, Be, B, C, N, O.