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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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First 20 Elements of the Periodic Table
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:max_bytes(150000):strip_icc()/what-are-the-first-20-elements-608820-FINAL-5b758ab446e0fb002c67279a.png "What Are the First 20 Elements? - Names and Symbols")
What Are the First 20 Elements? - Names and Symbols
Period (periodic table) - Wikipedia
