It is a gas.
At a temperature of 20 degrees C (or F, for that matter) oxygen is a gas.
Iodine is a solid at 20 degrees Celsius.
It is a gas.
Barium is a solid at 20 degrees Celsius.
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.
Plutonium is a solid at 20 degrees Celsius. It has a melting point of 639.4 degrees Celsius and a boiling point of 3228 degrees Celsius, so at 20 degrees it would be in a solid state.
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Thorium is solid at 20 degrees as it has a melting point of 2023 K ​(1750 °C) and a boiling point of 5061 K ​(4788 °C).
potassium has melted by time it reaches 20 degrees.
Niobium is a solid metal at 20 C.
(-20) degrees Celsius = -4 degrees Fahrenheit [°F] = [°C] × 1.8 + 32
Yes, it is.