General Knowledge Quiz for Monday, 20 January 2014

A new general knowledge quiz is available every day. Try today's quiz or work through our archive of daily and themed quizzes.

Question 1: The fifteen elements with atomic numbers 57 to 71, which includes Lanthanum (La), Cerium (Ce), Praseodymium (Pr), Neodymium (Nd), Promethium (Pm), Europium (Eu), Erbium (Er), Thulium (Tm), Ytterbium (Yb) and Lutetium (Lu), are known as what?