Q. 23 B4.7( 7 Votes )
What were the limitations of Dobereiner’s classification of elements?
A major limitation of DObereiner’s classification was that he could not arrange all the existing elements in the form of triads which comprised of elements having same chemical properties. He could only identify three sets of triads at that time. This drawback became the reason for his classification not becoming successful.
Besides this, he failed to describe any relation between the atomic mass of elements and the chemical properties.
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Elements have been arranged in the following sequence on the basis of their increasing atomic masses.
F, Na, Mg, Al, Si, P, S, Cl, Ar, K
i. Pick two sets of elements which have similar properties.
ii. The given sequence represents which law of classification of elements?Xam idea - Science
In Mendeleev’s Periodic Table the elements were arranged in the increasing order of their atomic masses. However, cobalt with atomic mass of 58.93 amu was placed before nickel having an atomic mass of 58.71 amu. Give reason for the same.Xam idea - Science
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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 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.
(c) State Modern periodic law.
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Study the following table in which positions of six elements A, B, C, D, E arid F are shown as they are in the modem periodic table:
On the basis of the above table, answer the following questions:
(i) Name the element which forms only covalent compounds.
(ii) Name the element which is a metal with valency three.
(iii) Name the element which is a non-metal with valency three.
(iv) Out of D and E, which is bigger in size and why?
(v) Write the common name for the family to which the elements C and F belong.Science - Board Papers
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