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Paper 1
Atomic structure & radioactivity
Atomic structure
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Cards (12)
What is the approximate radius of an atom?
1
×
1
0
−
10
m
1 \times 10^{-10} \text{ m}
1
×
1
0
−
10
m
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How does the radius of the nucleus compare to that of the atom?
The nucleus is less than
1/1000th
the radius of the atom
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Where is most of the mass of the atom concentrated?
In the
nucleus
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What two particles are found in the nucleus?
Protons
and
neutrons
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What charge do protons have?
Positive charge
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What charge do neutrons have?
No
charge
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What is the overall charge of the nucleus?
Overall
positive
charge
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What charge do electrons have?
Negative charge
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Where are electrons found in an atom?
In
energy levels
around the
nucleus
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How does the energy of an electron relate to its distance from the nucleus?
Further
energy levels
have higher energy
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What happens to an electron when it absorbs electromagnetic radiation?
It moves from a lower to a higher
energy level
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What occurs when an electron emits electromagnetic radiation?
It returns to a lower
energy level
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