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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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The First 20 Elements | ChemTalk
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WE Tutors - Get this colour coded Periodic Table of the first 20 elements to make your science lesson colourful . #education #teaching #teachers #teachingresources #learningaids #learning | Facebook