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The law of octaves was stated by :...

The law of octaves was stated by :

A

Dobereiner

B

Mendeleev

C

Moseley

D

Newland

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(i) Newlands proposed the law of octaves. ii) The law of octaves was not valid for elements that had atomic masses higher than calcium. iii) Newlands left blanks for new elements in his periodic table. Which statement is wrong?

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Do you know why Newlands proposed the law of octaves ? Explain your answer in terms of the modern structure of the atom .

Newlands proposed the law of octaves . Mendeleeff suggested eight groups for elements in his table . How do you explain these observations in terms of modern periodic classification ?

State law of triads .

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NCERT TELUGU-PERIODIC CLASSIFICATION-I-Questions (Choose the Best Answer)
  1. Elements whose atoms have their s and p-sub-levels complete are the:

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  2. The law of triad is applicable to :

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  3. The law of octaves was stated by :

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  4. Which of the following property decreases down a group :

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  5. Which of the following has the lowest melting point ?

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  6. Which of the following hydroxide is most basic ?

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  7. Excluding hydrogen and helium, the smallest element in the periodic ta...

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  8. Which one among the following species has the largest atomic radius:

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  9. Which among the following is the lightest metal ?

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  10. Which of the following has highest ionization potential?

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  11. With respect to chlorine, hydrogen will be

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  12. Which of the following element has the greatest tendency to lose elect...

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  13. Halogens belong to the :

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  14. Compared to first ionization enthalpy of an atom, the second is :

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  15. The correct arrangement of increasing atomic radius among Na, K, Mg, R...

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  16. The first attempt to classify the elements was made by :

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  17. Characteristic of transition elements is incomplete in :

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  18. Which of the following will have lowest first ionization enthalpy ?

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  19. Which of the following atoms is likely to give off more energy on gain...

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  20. Transition metals have the electronic configuration :

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