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Periodic Table How to use it… ATOMIC NUMBER: The number of protons in the nucleus. It is the number of protons that identifies the element. 12.011 -4 +2 +4 AtomicAc number 6 2-4 6 C ATOMIC MASS: The sum of the protons and neutrons in the nucleus AtomicAc mass 12.011011 -4 +2 +4 6 2-4 6 C NEUTRONS: ROUNDED ATOMIC MASS – ATOMIC NUMBER FOR EXAMPLE…CARBON ATOMIC MASS = 12.011…ROUNDED IS 12 ATOMIC NUMBER = 6 12 – 6 = 6 NEUTRONS ROUNDED ATOMIC MASS ATOMIC NUMBER VALENCE ELECTRONS: • Electrons that are involved in transfer or sharing • Located in the outer level of the atom • Not all electrons in an atom are involved in the sharing or transferring • 2 ways to represent the number of valence electrons: • The Bohr Model • Lewis Structure VALENCE ELECTRONS: 12.011 +2 +4 6 2-4 Electron configuration 2 - 4 -4 C PERIODIC TABLE OF ELEMENTS: Organization Atomic Mass of the all known elements based on their properties – such as atomic number. 12.011 C Atomic Number 6 2-4 -4 +2 +4 Selected oxidation state Electron Configuration