Radioactive Decay. Types of Radioactive Decay. Alpha Decay : nucleus eject an alpha particle (made of 2 protons and 2 neutrons – a helium nucleus) Can be shielded by a piece of paper Beta Decay : nucleus emits an electron or positron (electron with positive charge)
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6 seconds x = 3 half-lives
Pd-100 has a half-life of 3.6 days. If there are 6.02 x 1023 atoms at the start, how many atoms would be present after 20.0 days?