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Element
A substance that cannot be split onto simpler substances by chemical means.
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.
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
Mass number
Protons +neutrons
Note 
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