Page "Astatine" Paragraph 4

The bulk properties of astatine are not known with any great degree of certainty.

Research is limited by its short half-life, which prevents the creation of weighable quantities.

A visible piece of astatine would be immediately and completely vaporized due to the heat generated by its intense radioactivity.

Astatine is usually classified as either a nonmetal or a metalloid.

However, metal formation for condensed-phase astatine has also been suggested.