Question

How many elements were in the first periodic table?

Answer 1

here is your answer

63

there are 63 elements according to Mendeleev periodic table

and now in Modern Periodic table there are 118 elements

hope you understand

Answer 2

   HEY MATE

UR ANSWER IS

63 known elements in  when Mendeleev published his Periodic Table.

that time  the atom was considered the most basic particle of matter.electrons, protons, and neutrons were discovered only later. Mendeleev is often regarded as the father of the Periodic Table, Mendeleev himself called his table, or matrix, the Periodic System. Mendeleev had written the properties of elements on pieces of  the card and tradition has it that after organising the cards while playing patience he suddenly realised that by arranging the element cards in order of increasing atomic weight that certain types of element regularly occurred.

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