IONS...

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IONS...
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red and green are opposites
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assume red and green cancel each other
net color neutral
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take away one red
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take away one red
net color 1 green
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take away two red
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take away two red
net color 2 green
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net color neutral
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net color 2 red
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in this arrangement
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green is trapped inside. Only red balls can be
added or taken away
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color 2 green
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color 1 red
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color ?
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3 red
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color ?
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3 green
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What does that have to do with chemistry??
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In order to understand what ions are, we need to
know that
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the particles that make up atoms have
either positive or negative charge
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positive and negative are opposites
they cancel each other out
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net charge zero
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the positive () particle is called a
proton
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the negative (-) particle is called an
electron
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in an atom, protons ( ) are in the center and
electrons ( ) are on the outside

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only electrons ( ) can be added or taken away
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this is an atom with 5 electrons and 5 protons
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the atom is neutral
net charge zero
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5 (-) and 5 () zero charge (neutral)
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charge ?
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charge 1- (one minus)
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charge ?
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2 (two plus)
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WHEN REMOVING ELECTRONS
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WHEN REMOVING ELECTRONS
THE RESULTING CHARGE IS POSITIVE
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WHEN REMOVING ELECTRONS
THE RESULTING CHARGE IS POSITIVE
1
neutral
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WHEN ADDING ELECTRONS
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WHEN ADDING ELECTRONS
THE RESULTING CHARGE IS NEGATIVE
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WHEN ADDING ELECTRONS
THE RESULTING CHARGE IS NEGATIVE
2
neutral
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An atom with positive or negative charge
is called an
ION
drum roll
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SO...
Atoms without charge are called ATOMS
Atoms with positive or negative charge are called
IONS
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AND...
Notice that ONLY the number of e- changes
(Only electrons are added or subtracted)
The number of protons in an Atom NEVER changes
(why?)
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What do IONS have to do with anything??
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ions are required for your brain to
function (ions allow you to see and understand
this presentation)
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ions are an essential ingredient in soap
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ions are required for cellular respiration
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ions make up acids and bases
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ions keep your blood functioning
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