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Ions and Isotopes
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For an atom to have an overall negative charge
electrons were gained
electrons were lost
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How do you calculate mass number?
protons + neutrons
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How many protons does Calcium have?
20
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If Beryllium is electrically neutral, how many electrons does it have?
4
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If Arsenic has a charge of -3, then how many electrons does it have?
36
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In uranium - 235 what does 235 represent?
mass number
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Isotopes differ in the number of
protons
neutrons
electrons
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A charge of +2 means you have
more protons than neutrons
more electrons than neutrons
more protons than electrons
more electrons than protons
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What subatomic particle can NEVER change?
protons
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An atom with a + or - charge is called an
ion
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If Aluminum has a charge of +3, how many electrons are present?
10
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