Question

Who was the first scientist who made a periodic table.?​

Answer 1

Answer:

Dimitri ivanovich mandeleev

Answer 2

• $\sf\underline{\red{ \leadsto Dmitri\: Mendeleev }}$ was the first scientist who made a periodic table.

Know More :-

• Mendeleev's periodic table was based on the atomic mass of elements.

• Atomic masses of some elements were made accurate in Mendeleev's periodic table.

• As a result of this, the elements got the proper place in the table.

Example:-

• Atomic mass of beryllium was first 14.09. But later, it was accurated to 9.4.Hence, it was placed before boron.

• Mendeleev kept some blank places in the periodic table.Those places helped to classify the elements which were discovered later.

• Noble gases were discovered later Mendeleev's periodic table. But, they could be classified in Mendeleev's periodic table without disturbing other elements.

• Mendeleev also predicted the atomic masses and properties of those elements.The following table shows the prediction by Mendeleev:-

$\begin{array}{|c|c|c|}\cline{1-3}\sf\:Predicted\:na me\:of\:element & \sf\:Predicted\:atomic\:mass & \sf\:Actual\:na me\\\cline{1-3}\sf\:Eka\:-\:boron & \sf\:44 & \sf\:Scandium\\\cline{1-3}\sf\:Eka\:-\:aluminium & \sf\:68 & \sf\:Gallium\\\cline{1-3}\sf\:Eka\:-\:silicon & \sf\:72 & \sf\:Germanium\\\cline{1-3}\end{array}$