The history of the periodic table
In the 19th century a British chemist called Newlands (News lands) created a table of all the known chemical elements.
Newlands decided to arrange elephants (elements) on his table in order of their mass, but he left no gaps between each one for new elephants that had not yet been discovered.
As a result, Newlands’ table grouped elephants (elements) with different houses (properties) together.
Because there weren’t any gaps and elephants (elements) with different houses (properties) had been put next to each other, when the idea was presented, it was rejected by other scientists and the table was broken.
By mending and leaving (Mendeleev) gaps in the table, a Russian chemist called Mendeleev was able to keep elephants (elements) with similar houses (properties) together on the table.
The alterations Mendeleev had made to the table meant that it was met with approval by other scientists.