the number of protons is the atomic number of an element
... its number in the periodic table
atoms are neutral ... so the number of electrons is the same as protons
elements (atoms) have isotopes
... same number of protons , but different number of neutrons
the 18 after the chlorine is not standard nomenclature
... but it probably indicates the number of neutrons
List the numbers of protons, neutrons, and electrons in Chlorine-18.
1 answer