Predicting the properties for gaps in Mendeleev’s
table helps discover new elements. Because during his presentation of his
proposed periodic table, he noted some gaps in his table and predicted that
there are still unknown elements between those gaps. He uses some prefixes like
dvi-, tri-, and eka- in order to give provisional names to his predicted
elements. In his periodic table, he also laid out his elements from the
lightest to the heaviest element. The lightest elements started from zero, some
examples are gases.
