Answer :

The element among the options which is liquid at the room temperature is Bromine (Br) [Atomic Number = 35].

The chemical element bromine has the atomic number 35 and the symbol Br. It is the third lightest element in group 17 of the periodic table (halogens), and at room temperature, it is a volatile red-brown liquid that readily evaporates to form a vapor of a similar color. Its characteristics fall in between those of iodine and chlorine. It was discovered separately by two chemists, Carl Jacob Löwig (1825) and Antoine Jérôme Balard (1826), and was given the name o (bromos), which refers to its acrid and strong odour in Ancient Greek.

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