It' elemental - periodic table elements, [detailed data] interactive periodic table. including melting point, density, element history and crustal and oceanic abundance.. Group (periodic table) - wikipedia, In chemistry, a group (also known as a family) is a column of elements in the periodic table of the chemical elements. there are 18 numbered groups in the periodic. Periodic table elements chemistry reference sheet, Periodic table of the elements chemistry reference sheet california standards test sodium 22.99 na 11 atomic number element symbol average atomic mass*.

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