Possible Clues:

• Some contrast at inert entry in periodic table
• Element between polonium and radon on the periodic table
• Atomic number 85
• Not out to stop a nation producing radioactive material
• At home in America's capital, say
• At a function collecting trinketry
• At home in a country that is highly unstable
• Radioactive element
• Element in a couple of drugs
• At a function, carrying shabby clothes