Question

What predictions did mendeleev make, and why did he make them

Answer 1

Step-by-step explanation:

Soon, Mendeleev was predicting the properties of three elements – gallium, scandium and germanium – that had not then been discovered. So convinced was he of the soundness of his periodic law that he left gaps for these elements in his table.

Answer 2

Mendeleev's periodic table was helped more in creating modern periodic table as he arranged elements in the increasing order of atomic mass and moreover, he tried to arrange the elements on the basis of their reaction with hydrogen and oxygen because they are most reactive elements, react with most of other elements. In his period, 63 elements were known. So, this made quite easy for modern periodic table.

Here are some predictions of Mendeleev

Advantages of Mendeleev's periodic table

`{ \star}`Elements were grouped on more fundamental basis.

`{ \star}`Because of their placement in the periodic table, properties of several elements yet to be discovered like scandium, gallium and germanium could be predicted.

scandium predicted as Eka boron

gallium predicted as Eka aluminum

germanium predicted as Eka silicon

`{ \star}`Gaps for 40 new elements were kept.

`{ \star}`The discovery of new elements inert gases did not disturbed the arrangement and they found their place as a new group.