Which non-metal is unique among all non-metallic elements for being a liquid at standard room temperature and pressure?
Answer and explanation
Correct answer: D. Bromine
- Step 1: Bromine is a halogen non-metal with a red-brown colour that exists as a liquid at room temperature. Step 2. It is the only non-metallic element that is liquid under standard conditions. Answer: Bromine. Why not the others: Mercury is a liquid metal, not a non-metal; chlorine is a gas; iodine is a dark purple solid.
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