(A)The modern periodic table has been evolved through the early attempts of Dobereiner, Newland and Mendeleev. list one advantage and one limitation of all the three attempts.
(B)Name the scientist who first of all showed that atomic number of an element is a more fundamental property than its atomic mass.
sonukaushal2805:
Limitation or disadvantages...??
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a) dobereiner periodic table satisfied only 3triads no other elements could be arranged in this periodic table in new land periodic table only elements UpTo atomic number20 could be arranged no other elements can be arranged
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(A) Advantage- more elements get to know. more details about the element is added.
(B) go goolge it
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