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www.SimpleChemConcepts.com Proton Number (or Atomic Number) The number of protons in an atom Represented by symbol Z Tells us the number of electrons in atom also Atoms of different elements have different Z Nucleon Number (or Mass Number) The total number of protons & neutrons in an atom Represented by symbol A Mass of an atom depends on the number of protons and neutrons (electrons negligible) Nucleon Number (Mass Number) (A) = Number of Protons + Number of Neutrons Nucleon and Proton Numbers are included when representing an element in symbols. Nucleon Number (A) Proton Number (Z) Symbol Of ELEMENT Nucleon number or Mass number Chemical Symbol 23 Na 11 Proton number or Atomic number Persistence: “Most people run a race to see who is fastest. I run a race to see who has the most guts” - Steve Prefontaine Copyright 2008 @ SimpleChemConcepts.com