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Slide 2

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Atom ­ the smallest unit of matter "indivisible"
Helium
atom…read more

Slide 3

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electron shells
a) Atomic number = number of Electrons
b) Electrons vary in the amount of energy they
possess, and they occur at certain energy
levels or electron shells.
c) Electron shells determine how an atom
behaves when it encounters other atoms…read more

Slide 4

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Electrons are placed in shells
according to rules:
1) The 1st shell can hold up to two electrons,
and each shell thereafter can hold up to 8
electrons.…read more

Slide 5

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Octet Rule = atoms tend to gain, lose or share electrons so
as to have 8 electrons
C would like to Gain 4 electrons
N would like to Gain 3 electrons
O would like to Gain 2 electrons…read more

Slide 6

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Why are electrons important?
1) Elements have different electron
configurations
different electron configurations mean different
levels of bonding…read more

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