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Relative Atomic Mass defined as the average mass, of the mass numbers, of the isotopes, of the element, as they occur naturally, taking into account their abundances and expressed on a scale in which the atoms of the carbon-12 isotope have a mass of exactly 12 units.
Radioactivity the spontaneous breaking up of certain unstable nuclei with the emission of one or more types of radiation.
Radioactive decay. the process of changing from one radioactive element to another.
Nuclear reaction the emission of radioactive radiation.
Transmutation the emission of alpha and beta radiation from unstable nuclei we've seen how one element may be changed from one element into another.
Half-life The half life of an element is the time taken for half the nuclei in any given sample to decay.
Emission line spectrum the characteristic of that element and is different from that of any other element.
The Balmer Series ..contains all of the lines in the visible region of the hydrogen spectrum.
Lyman series all the lines in the UV region.
Paschen series all the lines in the IR region.
Energy level the fixed energy value that an electron in an atom may have.
Ground state. Lowest energy level.
Atomic Orbital a region of space where there is a high probability of finding an electron.
Exceptions to the EC rule Chromium: 1s2, 2s2, 2p6, 3s2, 3p6, 4s1, 3d5 Copper: 1s2, 2s2, 2p6, 3s2, 3p6, 4s1, 3d10
Created by: MitchO'N



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