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