Question

Which element is a liquid at STP?
(1) bromine (3) francium
(2) cesium (4) iodine

Answer 1

1. Bromine

Step-by-step explanation:

Reference Table S shows bromine’s melting point at 266 K and its boiling point as 332 K. Standard temperature and pressure (STP) is 273 K and one atmosphere of pressure. Bromine is a liquid at STP.

Answer 2

Among the choices, bromine exists as liquid under standard temperature and pressure conditions. Unlike other diatomic molecules which exist as gases, due to its heavy molecular weight, it exists as solid. Francium and cesium are solids while iodine is gas.Answer is 1.