Radioactivity

1. Who discovered two highly radioactive elements, polonium and radium, by purifying an ore of uranium called pitchblende?
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2. The spontaneous breaking up of unstable nuclei with the emission of one or more types of radiation is known as?
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3. These consist of two protons plus two neutrons being emitted from a larger particle?
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4. This is released when a neutron breaks down into a proton and an electron, the proton remains in the nucleus, while the electron leaves the atom at high speed?
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