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10 cards from this deck
Henri Becquerel
2 protons + 2 neutrons (helium nucleus)
Paper or a few centimetres of air
Few millimetres of aluminium
Several centimetres of lead
Removing or adding electrons to a neutral atom
~10% of the speed of light
Up to 90% of the speed of light
Decreases by 4
Decreases by 2
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