Chemical elements. - interactive periodic table , An up-to-date periodic table with detailed but easy to understand information. Atomic radius - wikipedia, The atomic radius of a chemical element is a measure of the size of its atoms, usually the mean or typical distance from the center of the nucleus to the boundary of. Chemtutor atomic structure, Atomic weights and atomic numbers . the integer that you find in each box of the periodic chart is the atomic number. the atomic number is the number of protons in.
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