Which element exists in liquid state at room temperature?

CONCEPT:

Physical States of Elements at Room Temperature

• Most elements exist in solid state at room temperature, while a few are gases.
• Only two elements exist in liquid state at room temperature: bromine (Br) and mercury (Hg).
• This is due to their low melting points relative to room temperature (approximately 25°C).

EXPLANATION:

• Room temperature is approximately 25°C (298 K).
• Gold (Au): Solid at room temperature because its melting point is 1064°C.
• Sodium (Na): Solid at room temperature because its melting point is 98°C.
• Magnesium (Mg): Solid at room temperature because its melting point is 650°C.
• Bromine (Br): Liquid at room temperature because its melting point is -7.2°C and boiling point is 59°C, making it a liquid in the range of typical room temperature.

Therefore, the element that exists in liquid state at room temperature is bromine (Br).