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Periodic Table of Elements - PubChem
Yttrium | Y (Element) - PubChem
Periodic Table - PubChem
Hydrogen | H (Element) - PubChem
Atomic Mass | Periodic Table of Elements - PubChem
Carbon | C (Element) - PubChem
Ytterbium | Yb (Element) - PubChem
Polonium | Po (Element) - PubChem
Beryllium | Be (Element) - PubChem
PubChem