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Hydrogen is a chemical element with symbol H and atomic number 1. With a standard atomic weight of 1.008, hydrogen is the lightest element on the periodic table.

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Helium is a chemical element with symbol He and atomic number 2.

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Lithium is a chemical element with symbol Li and atomic number 3.

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Beryllium is a chemical element with symbol Be and atomic number 4.

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Nitrogen is a chemical element with symbol N and atomic number 7.

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Oxygen is a chemical element with symbol O and atomic number 8.

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Carbon is a chemical element with symbol C and atomic number 6.

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Boron is a chemical element with symbol B and atomic number 5.

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Sodium is a chemical element with symbol Na and atomic number 11.

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Magnesium is a chemical element with symbol Mg and atomic number 12.

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Neon is a chemical element with symbol Ne and atomic number 10.

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Fluorine is a chemical element with symbol F and atomic number 9.

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Sulfur or sulphur is a chemical element with symbol S and atomic number 16.

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Phosphorus is a chemical element with symbol P and atomic number 15.

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Silicon is a chemical element with symbol Si and atomic number 14.

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Aluminium or aluminum is a chemical element with symbol Al and atomic number 13.

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Calcium is a chemical element with symbol Ca and atomic number 20.

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Potassium is a chemical element with symbol K and atomic number 19.

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Argon is a chemical element with symbol Ar and atomic number 18.

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Chlorine is a chemical element with symbol Cl and atomic number 17.