Electrons - negative subatomic particle, Electromagnetic radiation - a form of energy that exhibits wavelike behavior as it travels through space, Frequency - The amount of waves, Wavelength - The distance from one wave to another, Bohr Model - A model of an atom that shows all electrons orbiting, Ion - An atom with a charge due to losing or gaining electrons, Atom - The smallest unit of matter, Proton - positive subatomic particle, Neutrons - neutral subatomic particle, Nucleus - The center of the atom, Isotope - The same element with a different amount of neutrons, Valence Electrons - The electrons found on the outermost ring, Group - A column on the periodic table , Period - A row on the periodic table , Atomic Mass - The average of the isotopes of an element, Atomic Number  - The number of protons used to identify the element , Matter - Anything that takes up space, Homogenous mixture - A uniformed mixture, Heterogenous mixture - A mixture without uniform, Electromagnetic Spectrum - All the different forms of radiation energy, Chemistry - The study of matter ,

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