Which is the first element in the periodic table?, Hydrogen, Helium, Oxygen, Sodium, Name a noble gas, Oxygen, Helium, Nitrogen, Hydrogen, What is the atomic number of sodium?, 20, 10, 11, 21, Name the element with atomic number 12., Carbon, Phosphorus, Potassium, Magnesium, Name a halogen., Chlorine, Iron, Berillum, Lithium.

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