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Give a general idea of Dobereiner triads...

Give a general idea of Dobereiner triads with one example.

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It states that those triads in which the atomic weight of middle element was average of the atomic weight of first and third, such elements resemble the pysical and chemical properties, e.g.
`{:(Li,Na,K),(7,(7+39)/2=23,39):}`
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CENGAGE CHEMISTRY ENGLISH-APPENDIX - INORGANIC VOLUME 1-Exercise very short
  1. What is the basis of the long form of the periodic table?

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  2. Give a general idea of Dobereiner triads with one example.

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  3. Newland's law of octaves states that

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  4. State Mendeleev.s periodic law.

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  5. What is meant by periodicity of properties?

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  6. Why do elements in the same group have similar physical and chemical p...

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  7. State modern periodic law of classification of elements.

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  8. State the reason for periodicity of elements in periods and groups.

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  9. How many groups and how many periods are there in long form of periodi...

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  10. With which quantum number every period in periodic table begins?

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  11. What are s-block elements ? Write their general electronic configurati...

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  12. Give general electronic configuration of s-block elements.

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  13. What are p-block elements? Give their general electronic configurati...

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  14. Representative elements are elements of

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  15. What are d-block elements? Why are they called transition metals?

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  16. The general electronic configuration of d-block elements is

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  17. To which series man-made elements belong?

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  18. What is meant by lanthanides and actinides?

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  19. Which of lanthanides is man-made element?

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  20. What are inner transition metals? Why are they called rare earth metal...

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