That is the one with the sotnit check box, the melting point and the boiling point is very low. Don't do the reaction with chlorine and oxygen. This element should be bundled with any element.
That is the kind of gases are available. And a very low boiling point Does not react with chlorine and oxygen. This element should be grouped with any element.
The element is of a high melting point and boiling point where very low, do not react with chlorine and oxygen. This element should be reunited with any element.