chapter key terms.docx - Chapter 9 Key terms Atomic Size...

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Chapter 9 Key terms Atomic Size Determined by the distance between the outermost electrons and the nucleus. Bohr Model A model for the atom in which electrons travel around the nucleus in circular orbits at specific, fixed distances from the nucleus. Core Electrons Electrons that are not in the outermost principal shell. Electromagnetic Radiation A type of energy that travels through a space at a constant speed of 3.0x10^8 m/s. Electromagnetic Spectrum The entire range of electromagnetic radiation. Electron Configurations Shows the occupation of orbitals by electrons for a particular atom Electron Spin A fundamental property of all electrons that causes them to have magnetic fields associated with them. It can be either oriented up (+1/2) or down (-1/2). Emission Spectrum A spectrum associated with the emission of electromagnetic radiation by elements or compounds. Excited State An unstable state for an atom or a molecule in which energy has been absorbed but not remitted, raising an electron from the ground state into a higher energy orbital. Frequency The number of cycles or crests that pass through a stationary point in one second. Gamma Rays The shortest wavelength; they are produced by the sun, by stars, and by certain unstable atomic nuclei on Earth. Ground State The stat of an atom or molecule in which the electrons occupy the lowest possible energy orbitals available. Hund's Rule When filling orbitals of equal energy, electrons fill them singly first, with parallel spins. Infrared Light The heat that you feel when you place your hand near a hot object. Ionization Energy The energy required to remove an electron from the atom in the gaseous state.
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