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At STP, which list of elements contains a solid, a liquid, and a gas?
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2. Atoms & Elements
Periodic Table: Phases
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Which of the following elements is a liquid at room temperature (25°C)?
A
Bromine (Br)
B
Chlorine (Cl)
C
Mercury (Hg)
D
Iodine (I)
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Recall the physical states of elements at room temperature (25°C): solids, liquids, or gases.
Identify the common states of the given elements at 25°C: Bromine (Br), Chlorine (Cl), Mercury (Hg), and Iodine (I).
Remember that Chlorine (Cl) is a gas at room temperature, and Iodine (I) and Bromine (Br) are halogens with different states.
Note that Mercury (Hg) is a metal known to be liquid at room temperature, which is unusual for metals.
Conclude that among the options, Mercury (Hg) is the element that is liquid at 25°C.
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