An element whose physical and chemical properties are hard to fathom.

An element placed with a cat in a sealed box.

The fifth isotope of Symphonium, discovered in early 19th century Germany, but in a bizarre irony, it's first practical use was as part of the United Kingdom's war machine in world war two.

An element that is most frequently produced in Indian kitchens

Not an element, but the stuff that church pews are made of.