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http://www.chemicool.com/ Chemi Cool is a great source to learn and understand chemistry periodic table. You can see here very easy and comprehensive periodic table. You can understand elements by different colours for Solids, Gases, Liquids and Synthetic elements. Metals colours are also different for earth metals, alkali and Transitions metals. Also explore here complete list of chemical elements with their atomic numbers. http://www.ptable.com/ Periodic Table of Elements with different colours and mass number and isotopes. You can know here each element properties such as melting point, boiling point, electron, valence, hardness, radius, modulus, density heat and discovered year etc.
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