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Boxes on the Periodic Table What do they tell us?? Boxes on the Periodic Table The boxes on the Periodic Table give the following information about an element: symbol atomic number atomic mass Symbols One or two letter abbreviation for an element’s name Atomic Number (smaller) The number of protons or electrons in an atom of an element The periodic table is arranged in order of increasing atomic number Atomic Mass (bigger) The average mass of one atom of an element Measured in atomic mass unit (amu) The protons and neutrons add to make up the atom’s mass – (the electrons are too small to count) Calculating Subatomic Particles 3 Atomic Number Li Element Symbol Lithium Element Name 6.941 Atomic Mass Atomic Number = __3_ Atomic Mass = _7__ (protons + neutrons) # Protons = _3__ (the atomic number) # Electrons = _3__ (the atomic number) # Neutrons = __4_ (7 – 3) Calculating Subatomic Particles Element Symbol Atomic Number Copper Ca Atomic Mass # proton 64 29 40 19 (atomic number) # electron # neutron (atomic number) (atomic mass – atomic number) I have noticed… Atoms are neutral – same number of protons (+) and electrons (-) Neutrons are neutral, so they don’t count! Only 2 of the 3 subatomic particles make up an atom’s mass; the protons and neutrons And lastly… If you change the number of protons in an atom you have another element If you change the number of neutrons in an atom you have an isotope If you change the number of electrons in an atom you have an ion that is ready for bonding