Why isotopes were not given any place in the mandeleev's periodic table - Science - Periodic Classification of Elements

Question

Why isotopes were not given any place in the mandeleev's periodic
table?

Anshu Agrawal · Accepted Answer

Dear student,

Isotopes are the atoms of the same element having different atomic
masses Therefore, according to Mendeleev’s classification
these should be placed at different places depending upon their
atomic masses

Because modern
periodic table is arranged according to the atomic number of the
elements Whereabout isotopes have same atomic number (but different
atomic mass) And that's why isotopes don't occupy an indiviual
position in periodic table

For example, hydrogen
isotopes with atomic masses 1,2 and 3 should be placed at three
places However, isotopes have not been given separate places in the
periodic table because of their similar properties
Regards

Why isotopes were not given any place in the mandeleev's periodic table?