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Atomic Numbers of the First 20 Elements in the Periodic Table Quiz - Trivia & Questions
The First 20 Elements | ChemTalk
![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 -
The First 20 Elements | ChemTalk
Give an atomic number, atomic symbol, atomic mass of the first 20 elements
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What Are the First 20 Elements? - Names and Symbols
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:max_bytes(150000):strip_icc()/GettyImages-183053303-95f6bb760bc542d4a4de18020ba49c5e.jpg "First 20 Elements of the Periodic Table")