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How to Obtain the Number of Sub-Atomic Particles in an Atom Using a Periodic Table

+. = 8 = 8 = 8. +. +. +. -. How to Obtain the Number of Sub-Atomic Particles in an Atom Using a Periodic Table. -. -. -. 8. +. +. +. O. -. -. +. +. Oxygen. -. 15.9994. -. -. Protons. Neutrons. Electrons. +. -.

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How to Obtain the Number of Sub-Atomic Particles in an Atom Using a Periodic Table

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  1. + = 8 = 8 = 8 + + + - How to Obtain the Number of Sub-Atomic Particles in an Atom Using a Periodic Table - - - 8 + + + O - - + + Oxygen - 15.9994 - - Protons Neutrons Electrons + - Equal to the atomic mass (rounded to a whole #) minus the # of protons Equal to the atomic # on the Periodic Table Equal to the # of protons Example: Determine the # of protons, neutrons, and electrons in an atom of oxygen. Protons = 8 (Atomic #) Neutrons = 8 (Rounded atomic mass minus atomic #) Electrons = 8 (# of P) Neutron Calculations = 16 (P + N) – 8 (P) = 8 N

  2. + = 8 = 8 = 8 + + + - How to Obtain the Number of Sub-Atomic Particles in an IonUsing a Periodic Table - - - 2- Notice how two electrons have been gained by the atom, thus resulting in an ion + - + O + - + + 10 - - - Neutrons Protons Electrons + - Equal to the # of protons plus the # in the upper right corner if followed by a (-) OR minus the # in the upper right corner if followed by a (+) Equal to the atomic mass (rounded to a whole #) minus the # of protons Equal to the atomic # on the Periodic Table - Example: Determine the # of protons, neutrons, and electrons in the oxygen ion O²¯. Protons = 8 (Atomic #) Neutrons = 8 (Rounded atomic mass minus atomic #) Electrons = 10 Neutron Calculations = 16 (P + N) – 8 (P) = 8 N Electron Calculations = 8 (e) + 2 (e) = 10 -

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