HYDROGEN, HELIUM, LITHIUM, BERYLLIUM, BERYLLIUM, BORON, BORON, NITROGEN, NITROGEN, CARBON, CARBON, OXYGEN, OXYGEN, FLUORINE, FLUORINE, NEON, NEON, SODIUM, SODIUM, MAGNESIUM, MAGNESIUM, ALUMINIUM, ALUMINIUM, SILICON, SILICON, PHOSPHORUS, PHOSPHORUS, SULFUR, SULFUR, CHLORINE, CHLORINE, ARGON, ARGON, POTASSIUM, POTASSIUM, CALCIUM, CALCIUM

20 FIRST ELEMENTS

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