Step-by-step explanation:
Normal Earth temperature means the standard temperature and pressure conditions. At STP, temperature is 273 K or zero degree celsius and pressure is 1 atm.
For gases at STP, volume is equal to 22.4 liter.
So, at normal Earth temperature sodium exists as a solid whereas oxygen exists as a gas.
On the other hand, both bromine and mercury exists as liquid at normal Earth temperature.