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An isotope is a version of an element with the same number of protons but different number of __________.
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Describe the structure of an alpha particle.
a fast-moving electron
2 protons and 2 neutrons
a slow-moving neutron
a hydrogen nucleus
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What is the relative charge of an alpha particle?
-1
0
1
2
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Select all of the properties of alpha particles.
Highly ionisation
Highly penetrating
Weakly ionising
Weakly penetrating
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An alpha particle can be stopped by _________________.
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In alpha decay, the mass number...
increases by 2
decreases by 2
increases by 4
decreases by 4
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In alpha decay, the atomic number...
increases by 2
decreases by 2
increases by 4
decreases by 4
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The mass number of Neptunium (Np) is _____.
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The atomic number of Neptunium (Np) is _____.
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Explain how alpha decay is used in smoke detectors.