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10/05/1852 Valence theory

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The Electron: Crash Course Chemistry #5

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Valence Electrons and the Periodic Table

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Valence electrons and bonding | Periodic table | Chemistry | Khan Academy

English chemist Edward Frankland published his theory of chemical valence. It states atoms come together to make chemical compounds in regular ratios. This was – according to Frankland – caused by combining power of each element. Later August Kekulé proposed fixed valences for many elements, such as 4 for carbon.
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