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Prove that the halogens, chlorine, bromi...

Prove that the halogens, chlorine, bromine and iodine follow the law of triads.

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When the halogens, chlorine, bromine and iodine are placed on below the others, they had similar properties. The atomic weight of bromine was close to the average of the atomic weights of chlorine and iodine.
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FULL MARKS-PERIODIC CLASSIFICATION OF ELEMENTS -Additional Questions(3 MARK QUESTIONS)
  1. Why there is a need for classification of elements?

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  2. Prove that the halogens, chlorine, bromine and iodine follow the law o...

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  3. What are the salient features of Newland's law of octaves?

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  4. How the properties of Eka-silicon was related to germanium?

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  5. Compare the properties of Eka-aluminium and gallium.

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  6. Explain about the relationship between the atomic number of an element...

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  7. What are the reasons behind the Moseley's attempt in finding atomic nu...

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  8. Draw a simplified form of periods and elements present in modern perio...

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  9. Write the electronic configuration of alkali metals ""(3)Li,(11)Na, ""...

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  10. Explain about the classification of elements based on electronic confi...

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  11. Write about the electronic configuration of 1^(st) and 2^(nd) period.

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  12. How many elements are there in 4^(th) period? Prove it.

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  13. How many elements are there in 6^(th) period? Prove it.

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  14. What are the two exceptions of block division in the periodic table?

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  15. Explain about the salient features of metals.

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  16. Explain about the characteristic of non - metals.

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  17. Periodic change in electronic configuration is responsible for the phy...

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  18. What is covalent radius ? . How would you determine the covalent radiu...

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  19. Define metallic radius.

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  20. Arrange Na^(+),Mg^(2+) and Al^(3+) in the increasing order of ionic ra...

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