Periodic Table
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Last updated 2:05 PM on 10/20/24
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4 Terms
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Element
A substance that cannot be split onto simpler substances by chemical means.
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Triad
A group of three element with similar chemical properties in which the atomic weight of the middle element is approximately equal to the average mass of the other two.
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Relative atomic mass
The average of the mass number of the isotope of the element, as they occur naturally, taking their abundance into account and expressed on a scale in which the atoms of the carbon 12 isotope has a mass of exactly 12 units
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Mass number
Protons +neutrons
Note 
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