Chemistry

Clues in this puzzle

Across

• A substance that neutralizes an acid (4)
• Gas in the air that humans need to breathe (6)
• Precious yellow metal with the atomic symbol Au (4)
• An atom that has gained or lost electrons (3)
• The most abundant gas in Earth's atmosphere (8)
• Metallic element with the chemical symbol Sn (3)
• State of matter that keeps its shape and volume (5)

Down

• A liquid mixture where a solute is dissolved in a solvent (8)
• The lightest and most abundant element in the universe (8)
• Noble gas used to make bright glowing signs (4)
• State of matter with no fixed shape or volume (3)
• Element found in all organic life forms (6)
• Silvery metal that is also the name of a five cent coin (6)
• State of matter that flows and has a definite volume (6)
• Common metal used to make steel (4)

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