The modern periodic table is based closely on the ideas he used. Cal: And how is it ordered? Mrs Roberts: So, the elements are arranged in order of increasing atomic number. The horizontal rows ...
Thus, in the modern periodic table, the elements are arranged according to their atomic number - not their relative atomic mass. "We now know the 'how it works, why it works', and this is to do ...
The modern periodic table The periodic table is a way of organising the elements which is used by scientists to group elements with similar properties. It has a unique arrangement of rows and columns.