And you can arrange the items in the table to perform, and laws and regulations, and so that the number of elements have not changed?
Yes possible if lanthanides placed in a column under lanthanum, hafnium and lutetium will follow already horizontally. Also done with actinides, but the table turns ugly.
Build a simple graph of the results Chadwick, we see that for platinum he was to receive a charge equal to the value of about 80.
Therefore, the charge of the nucleus of platinum and close to it the elements to check.