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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 the ability of an atom in a chemical compoundto attract electron |
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 |
isotope | each of two or more forms of the same element that contain equal numbers of protons but different numbers of neutrons in their nuclei, and hence differ in relative atomic mass but not in chemical properties; in particular, a radioactive form of an element |
planck's constant | a constant value that relates the energy of a photon of light to its frequency |
valence electron | a single electron or one of two or more electrons in the outer shell of an atom that is responsible for the chemical properties of the atom |
wavelength | the distance between any given point and the same point in the next wave cycle. |