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Which of these elements is a halogen?
What is the process of converting a gas into a liquid called?
What is the oxidation state of oxygen in most compounds?
Which subatomic particle has no electric charge?
Which of the following is used as a catalyst in the Haber process?
Which of the following is a greenhouse gas?
What is the term for a substance that speeds up a reaction without being consumed?
What is the pH range of a strong acid?
Which element is the lightest gas known?
Which element is essential for photosynthesis and found in chlorophyll?