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.
Radium is a solid metal at 20 0C.
nothing
(-20) degrees Celsius = -4 degrees Fahrenheit [°F] = [°C] × 1.8 + 32
8
27
-4 deg F = -20 deg C
Mercery is not solid at 20 degrees.
At -50 0C radon 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.
It is a gas.
Plutonium at 20 C would be a solid.
solid
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.
When you add extreme temp. tosulfur the sulfer turns into a yellow solid
Niobium is a solid metal at 20 C.
(-20) degrees Celsius = -4 degrees Fahrenheit [°F] = [°C] × 1.8 + 32