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Science · 2022 · 2 marks
CBSE 2022 · Region 3 · Set 1 · Q3
State the criteria used by Mendeleev for creating his Periodic Table. Compare the position of isotopes of elements in the Mendeleev's Periodic Table and in the Modern Periodic Table.
Marking-scheme solution
Atomic mass
Isotopes were discovered after the proposal of Mendeleev's periodic classification. / No position was given to the isotopes in Mendeleev's Periodic table.
While Modern periodic table is based on the atomic number of elements so isotopes are not given any position in Modern periodic table.
Alternative answer,
No position was given to isotopes in Mendleev Periodic Table and Modern Periodic Table.More from Periodic Classification of Elements
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CBSE Class 10 Science past-paper question from the 2022board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.