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Paper 1
Atomic structure
Radioactive decay
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Cards (15)
What is the central part of an atom called?
Nucleus
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What particles are contained in the nucleus?
Protons
and
neutrons
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What is the plural of nucleus?
Nuclei
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What is the relative charge of a neutron?
0
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What is the relative mass of a neutron?
1
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What is the relative charge of a proton?
+1
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What is the relative mass of a proton?
1
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How many neutrons and protons does stable carbon-12 have?
6
protons and
6
neutrons
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What happens as the number of protons increases in an element?
More
neutrons
are needed for stability
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How many protons does lead-206 have?
82
protons
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How many neutrons does lead-206 have?
124
neutrons
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What is radioactive decay?
Unstable
atomic nuclei
break apart, releasing
radiation
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What is radiation?
Energy carried by particles from a
radioactive
substance
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What happens to nuclei with too many or too few neutrons?
They are
unstable
and will decay
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How does the stability of an atom's nucleus depend on the number of neutrons?
It
must
have
a
certain
amount
for
stability
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