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State Dobereiner's law of triads, with a...

State Dobereiner's law of triads, with an example.

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Dobereiner.s law of triads states that the atomic weight of middle element was average of the atomic weight of first and third element. Such elements resemble physical and chemical properties For example `overset(Li)" 7 "overset(Na)" 23 "overset(K)39`
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OMEGA PUBLICATION-CLASSIFICATION OF ELEMENTS AND PERIODICITY IN PROPERTIES-Multiple Choice Questions (MCQs)
  1. State Dobereiner's law of triads, with an example.

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  2. Mendeleev's periodic law is based on

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  3. In the modern periodic table elements are arranged in order of

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  4. The modern periodic table known as the long form of periodic table was...

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  5. The long form of periodic table has

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  6. Fill in the blanks: The elements of group 17 are called…........

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  7. Alkaline earth metals belong to

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  8. Which of the following represents the electronic configuration of d-bl...

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  9. Explain why transition elements have high melting and boiling points ?

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  10. Which among the following will have largest size ?

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  11. Which of the following is/are correct?

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  12. The energy required to remove an electron from a gaseous atom from its...

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  13. In a period from Li to F ionisation enthalpy

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  14. Given the correct order of electronegativity of central atom in follow...

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  15. The electronegativities of F and H are 4.0 and 2.1 respectively. The p...

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  16. Which of the following element has maximum electron gain enthapy(neg...

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  17. The main source of energy is ….. .

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  18. The 3rd period of the periodic table contains

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  19. Which of the elements show least values of ionisation energies within ...

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  20. r("van der Waal") is

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  21. Which of the following does not have any unit?

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