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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 -](https://pbs.twimg.com/media/FFXkktyXMAMp5dx.jpg:large "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 -")
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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