An element is lustrous, conducts electricity well and is a liquid at room temperature. Which element is it?
Answer & explanation
Correct answer: option 3
The correct answer is Option (3) → Mercury
Lustre and good electrical conduction are properties of metals, and mercury is the only metal that is a liquid at room temperature. Bromine is also a liquid, but it is a non-metal that does not conduct electricity; sodium is a solid metal and iodine a solid non-metal.