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匿名 發問於 科學及數學化學 · 10 年前

chem自學(4) - the planet


Which of the following noble gases is the most abundant in air?

Argon, helium, Krypton, Neon


Are argon & nitrogen compounds? Explain your answer.

1 個解答

  • 10 年前

    1. argon, 0.97% of air.

    others are minimal.

    2. no. compound can be defined as "substances that can be chemically broken down". both argon and nitrogen cannot be chemically broken down, so they're not compounds.

    another definition of compound is "a substance that not every atoms in it have same number of protons". in carbon dioxide, there're some atoms having 6 protons in each of them (carbon), while some have 8 (oxygen). thus carbon dioxide is a compound.

    in argon, every atom has 18 protons in its nucleus, so argon is not a compound.

    in nitrogen, every atom has 7 protons in its nucleus, so nitrogen is not a compound.

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