The correct answer is: D. Mercury
Mercury is the only metal that is liquid at room temperature and pressure. It is a silvery-white metal that is highly reflective and has a low melting point. Mercury is used in a variety of applications, including thermometers, barometers, and fluorescent lamps.
Radium is a radioactive metal that is found in uranium ores. It is a silvery-white metal that is highly reactive and has a high melting point. Radium is used in a variety of applications, including medical imaging and industrial radiography.
Zinc is a blue-white metal that is found in zinc ores. It is a relatively soft metal that has a low melting point. Zinc is used in a variety of applications, including galvanizing steel, batteries, and alloys.
Uranium is a radioactive metal that is found in uranium ores. It is a silvery-white metal that is highly reactive and has a high melting point. Uranium is used in a variety of applications, including nuclear power plants and nuclear weapons.