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Niels Bohr proposed that electrons must have enough energy to keep them in constant motion around the nucleus Electrons occupy orbits of only certain amounts of energy (called quantum) The energy of an electron can be increased by high voltage electricity, electromagnetic radiation or waves that both have electric and magnetic properties Wavelength is the distance between the peaks measured in meters and nanometers frequency how often do the peaks come threw per a minute Energy the more busy the wave, the more energy it posses Frequency goes up wave length goes down and energy goes up Each element emits a different emission spectrum, or spectrum of light released from exited atoms of the element Because electrons can have only certain amounts of energy , they can move around the nucleus only at distances that correspond to those amounts of energy Energy levels are the regions of space in which electrons can move about the nucleus Ist energy level can hold 2 2nd energy level can hold 8 3rd energy level can hold 18 Democritus proposed the world is made up of empty space and atoms are the smallest particals Antoine Lavoisier concluded that when a chemical reaction occurs matter is neither created nore destroyed