(Z, proton number)
(number of protons in an atomic nucleus)
An element's atomic number (or proton number, typically
symbolized as Z) is the number of protons in its nucleus.
(An element is defined to be atoms with that element's
associated atomic number.)
The number of protons determines how many electrons orbit within
neutral atom of the element, a major determinant of the element's
Chemistry's periodic table of the elements lays them out in the
order their atomic numbers, lining them up in columns such that
elements in a column tend to have similar chemical properties.
Referenced by pages:
valley of beta stability