निम्नलिखित धातुओं में से कौन-सी सबसे हल्की है (जिसका घनत्व सबसे कम है)?

Identify the chemical symbol used for Iron.

Which of the following metals exists as a liquid at temperatures slightly above the standard room temperature (above 30°C)?

Which of the following non-metals exists in a liquid state at room temperature (25°C)?