Triacetates of this element regioselectively react with phenols to preferentially create quaternary carbon centres. The primary ore of this element was used in early examples of the ‘cat’s whisker detector’. William Andrew Oddy designed a test for the safety of materials which involves using copper, silver (-5[1])and this element. Adding potassium iodide to this element’s (*) nitrate is known as the ‘golden rain’ reaction as it produces a notable yellow precipitate. Due to the inert pair effect, this element’s dioxide is often used as an oxidising agent as this element’s +2 (“plus two”) oxidation state is more stable than (10[1])the +4 (“plus four”) and as a result this element is often contrasted with carbon as they are in the same group. This metal is used with uranium in a technique for radiometric dating. For 10 points, name this toxic metal with chemical symbol Pb. (10[2])■END■