The only non-metal element that is a liquid at room temperature I know of is Bromine of group 7.
Mercury is a metal that is liquid at 20 degrees Celsius.
At 20 degrees Celsius, krypton would be in its gaseous state. Krypton is a noble gas with a boiling point of -153.22 degrees Celsius, so at 20 degrees Celsius it would be well above its boiling point and exist as a gas.
Mercury is a metal that is a liquid at 20 degrees Celsius and is commonly used in thermometers due to its unique properties, such as being non-wetting, high density, and having a high coefficient of thermal expansion which makes it a suitable choice for measuring temperature accurately.
Solid, assuming normal atmospheric pressure.
Gaseous state. The boiling point of radon is -71 degrees C. So at 20 degrees C, it is above the boiling point and is a gas at this temperature.
Niobium is a solid metal at 20 C.
20 degrees Celsius is about room temperature. At room temperature, mercury is a liquid.
Mercury is a metal that is liquid at 20 degrees Celsius.
Ammonia (NH3) is a (very 'water' soluble) gas
Bromine is a liquid at 20 degrees Celsius. It has a melting point of -7.2 degrees Celsius and a boiling point of 58.8 degrees Celsius.
Mercury is a metal that is a liquid at room temperature (~20 degrees Celsius). It has a melting point of -38.83 degrees Celsius and a boiling point of 356.73 degrees Celsius.
Hydrogen is a gas at 20 degrees, Fahrenheit and Celsius, but it you are talking Kelvin, then it is a liquid.
Solid
It's a solid.
It's a solid.
Oxygen is a gas at 20 degrees Celsius. It has a boiling point of -183 degrees Celsius and a melting point of -218 degrees Celsius, so at room temperature, oxygen exists as a gas.
Nitrogen ice is solid. Liquid nitrogen is liquid. At standard temperature and pressure, nitrogen is gaseous.