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Unit 2
Unit 2: Atomic structure
Term | Definition |
---|---|
Atomic emission spectrum | the variety of frequencies of electromagnetic radiation(light) seen through a spectroscope that are emitted by electrons as they transition from higher to lower energy levels; unique for each element |
Atomic radius | one half of the distance between the center of identical atoms that are not bonded together |
Electromagnetic Spectrum | all of the frequencies or wavelengths of electromagnetic radiation |
Electronegativity | a measure of ability of an atom in a chemical compound to attract electrons |
frequency | the number of cycles or vibrations per unit of time ;also the number of waves produced in a given amount of time |
hyphen notation | a way of designing the isotopes of an element using its name (or symbol), a hyphen, and the mass number ( example: uranium-238) |
ionic radius | a measure of the size of an ion of an element in a crystal |
ionization energy | the energy required to remove an electron from an atom or ion (IE) |
isotope | an atom that has the same number of protons(or the same atomic number) as other atoms of the same element but that has a different number of neutrons(and thus a different atomic mass) |
planck's constant | a constant value that relates the energy of a photon of light to its frequency |
valence electron | an electron that is found in the outermost shell of an atom and that determines the atom's chemical properties |
wavelength | the distance from any point on a wave to an identical point on the next wave |