# The discovery of what element showed the usefulness of Mendeleev's periodic table?

Mar 30, 2017

The discovery of three, hypothetical elements old Mendeleev called $\text{ekasilicon,}$ $\text{ekaaluminium,}$ and $\text{ekaboron.}$
And these were later characterized and given formal names of $\text{germanium}$, $\text{gallium}$ and $\text{scandium}$, respectively. Before Mendeleev's time (and he shared the discovery of Periodicity with other independent researchers, most notably Lothar Meyer) much was known of the properties and chemistry of the then known elements. Not a great deal was known as to how the elements related to each other. And the proposed Periodic Tables provided a systematic framework.