Of the six natural noble gases, all found on Earth between 1894 and 1900, which was discovered last?

Children usually have all 20 of which "deciduous" body parts by about age 3? All three English kings with which name died violently? All five of Rhode Island's counties border which bay? All six known examples of whose signature date from between 1612 and 1616? "All animals are equal, but some animals are more equal than others" is from a 1945 book by which author? "All children, except one, grow up" is the opening line of which story? "All creatures drink of joy at nature's breast" comes from Schiller's verse used in an 1824 symphony by which composer? When you're all dressed up, you're said to be in your ___ best.