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Heisenberg Principle Impossible to know the position and the momentum of an electron at the same time Bohr Model idea that electrons orbit the nucleus; incorrect De Broglie's Hypthesis Matter (electrons) can be thought of as having properties of both a particle and a wave shells 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 Alpha Decay Atomic number decreases by 2 the mass number by 4 (2p 2n) Beta decay neutron converted to a proton. An electron is emitted. THe atomic number increases by 1 but mass # stays the same Positron Emission A proton is converted to a neutron. A positron is emitted. The atomic number decreases by 1 and the mass # stays the same