SCIENCE: Periodic Table: Element, atomic number 5, Symbol B?

Questions

What is the name of the Czech village which was destroyed on 10 june 1942 by the nazis in retaliation for the assassination of Reinhard Heydrich, deputy leader of the SS?

Name of a 1960s group and also the place in St Pauls where monks finished their paternoster on Corpus Christi day?

Name of the Aztec city on whose ruins Mexico City was founded?

If an animal is an operculate what characteristics does it have?

Who is the sculptor of Newton on the piazza of the new British Library at St Pancras?