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EuChemS on X: "[#Chemistree contest] Let's start our contest with a question on the first element of the Periodic Table: Hydrogen! All of the following are isotopes of hydrogen, except: - Tritium -
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What Are the First 20 Elements - Names and Symbols
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1.13 Deduce the electronic configuration of the first twenty elements from their positions in the periodic table. - iGCSE CHEMISTRY REVISION HELP