These elements, with atomic numbers of 113, 115, 117, and 118 comprise the missing parts of period 7 – the lowest row – of the periodic table. Now, IUPAC, the International Union of Pure and ...

Mrs Roberts: Well, the modern periodic table shows us all of the elements arranged in rows, which are called periods ... and chemical properties and show trends. The table below shows the melting ...

The Laboratory in Blue Prince is home to two puzzles: the periodic table puzzle and the machine puzzle. Both puzzles are ...