when Henry Moseley carried out work into the characteristic X-rays emitted by atoms – he was able to show that their frequencies were proportional to the square of the atomic number. Up until this ...

Watch this video to find out more information on the periodic table close periodic tableA table which lists all of the chemical elements and arranges them in a way that is useful. It allows us to ...

The finished puzzle is a section of the periodic table, so the numbers on each tile ... its destination, and the empty square. Then move tiles around in that loop. Sometimes you will have to ...