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.

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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.

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(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 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.

(c) State Modern Periodic law.

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The modern periodic table was prepared by :

(a) Dobereiner (b) Newlands (c) Bohr (d) Mendeleev

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(a) State Newland Law of Octaves. [1 Mark]
(b) With an example, explain Dobereiner's Triads. [1 Mark]
(c) List one limitation each of both the attempts mentioned in 'a' & 'b'.

[½ + ½ M a r k]

[3 Marks]

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is position of isotope a limitation or advantage of mendeleeve in his periodic table

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