The elements that are liquid at room temperature (25°C) are:
Show answer & explanation
Correct answer: A
Explanation
The correct answer is option 1 i.e. bromine and mercury.
At room temperature (25°C), only two elements are liquid:
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Bromine (Br) – a reddish-brown liquid nonmetal.
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Mercury (Hg) – a silvery liquid metal.
The other elements listed:
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Helium (He) – a noble gas, exists as a gas at room temperature.
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Chlorine (Cl) – a yellow-green gas at room temperature.
So, the correct pair of liquid elements at 25°C is bromine and mercury.