Which of the following is a non metal that remains liquid at room temperature?

Which of the following is a non metal that remains liquid at room temperature?

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1) Actinides are the elements with atomic numbers from

2) Which of the following is used as a lubricant?

3) Chlorophyll is a naturally occurring chelate compound in which central metal is

4) The property of a substance to absorb moisture from the air on exposure is called

5) How many colours the sunlight spectrum has?