
043
Now that we’ve split the elements into categories, let’s line them up and look
for a pattern. Do you see it?
The elements, if arranged according to their atomic weight, exhibit an appar-
ent periodicity of properties.
This is what the Russian scientist Dmitri Mendeleev discovered and wrote
in his presentation “The dependence between the properties of the atomic
weights of the elements.” He pointed out that this periodicity can be used to
crea ...