Question

Which of the following substances are elements ?
Water, Salt, Mercury, Iron, Marble, Diamond, Wood, Nitrogen, Air, Graphite, Hydrogen, Oxygen, Sugar, Chlorine

Answer 1

Answer:

• Mercury
• Iron
• Nitrogen
• Hydrogen
• Oxygen
• Chlorine

Answer 2

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❀ Mercury

❀ Iron

❀ Nitrogen

❀ Hydrogen

❀ Oxygen

❀ Chlorine