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Please take your own notes.
Atomic Math Please take your own notes.
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# of Protons Atomic number = number of protons 7
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# of Electrons Atomic number = number of electrons 7
Note: This is true for ATOMS where the positives (protons) balance out the negatives (electrons). This is NOT true for IONS which have extra charges…
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Atomic Mass Atomic mass = # Protons + # Neutrons 7
Definition: Nucleon is a particle in the nucleus. Protons and neutrons are both “nucleons” Note: Atomic mass = # of nucleons
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Number of Neutrons Atomic mass = # Protons + # Neutrons
# Neutrons = Atomic Mass - Atomic Number 7
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Na Different Notations Atomic Mass is always the larger number
Outside of the periodic table, you might see something like this: Atomic Mass 23 Na 11 Atomic number Atomic Mass is always the larger number
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Where do electrons go? 1st Shell Holds up to 2 2nd Shell Holds up to 8
3rd Shell Holds up to 18 Rule: Fill from the inside out
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