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

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How to Obtain the Number of Sub-Atomic Particles
in an Atom Using a Periodic Table
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8



O
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Oxygen
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15.9994
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Protons
Neutrons
Electrons

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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
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How to Obtain the Number of Sub-Atomic Particles
in an Ion Using a Periodic Table
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2-
Notice how two electrons have been gained by the
atom, thus resulting in an ion


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O

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10
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Neutrons
Protons
Electrons

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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
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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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