The non-metal which exists in the liquid state at room temperature is :
(a) fluorine
(b) chlorine
(c) bromine
(d) iodine
Identify the non-metal which exists in liquid state at room temperature (250C).
Which of the following statements are correct? (a) Helium has the highest first ionisation enthalpy in the periodic table (b) Chlorine has less negative electron gain enthalpy than fluorine (c) Mercury and bromine are liquids at liquids at room temperature (d) In any period, the atomic radius of alkali metal is the highest