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Moseley calculated the number of positiv...

Moseley calculated the number of positive charges in the atoms by analysing their____.

A

X-ray patterns

B

line spectrum

C

chemical properties

D

a-ray patterns

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BEYOND PUBLICATION-CLASSIFICATION OF ELEMENTS THE PERIODIC TABLE-EXERCISE
  1. Element with electronic configuration 1s^2 2s^2 2p^6 3s^2 3p^6 3d^10 4...

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  2. The element with atomic number 7 is found in

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  3. Moseley calculated the number of positive charges in the atoms by anal...

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  4. Elements with electronic configuration ns^1 and ns^2 are called

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  5. Atomic weight =

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  6. No. of groups in modern periodic table................

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  7. According to Mulliken, electronegativity =

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  8. Elements from ^(58)Ce to ^(71)Lu are called

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  9. Correct order of size

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  10. Electron affinity of Fluorine is less than that of Chlorine because

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  11. In dobereiner triad, the atomic weight of middle element is :

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  12. Which of the following relation is correct ?

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  13. 5f elements are called............

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  14. Periodicity is observed in periodic table due to reappearance of simil...

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  15. The formula of oxides and chloride of Eka-Silicon is

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  16. Which block the element having 1s^2 2s^2 2p^4 beongs to ?Why ?

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  17. Which elements are called p-block elements ?

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  18. What is the valency of IVA group elements with respect to hydrogen ?

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  19. Because of screening effect, the ionization energy becomes less. Expla...

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  20. "The properties of elements are the periodic functions of their atomic...

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