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Give one use each of the follwing radioa...

Give one use each of the follwing radioactive isotopes :
(a) Uranium-235 (b) Cobalt-60.

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LAKHMIR SINGH & MANJIT KAUR-STRUCTURE OF ATOM-Exercise
  1. The atomic number of an element X is 16 (a) Write down the electric ...

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  2. What valencies will be shown by the elements A, B, C, D and E having a...

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  3. Give one use each of the follwing radioactive isotopes : (a) Uranium...

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  4. Explain why .(1)^(3)H and .(2)^(3)He are not considered isotopes

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  5. What is the reason for the different atomic masses of the isotopes of ...

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  6. What is the reason for the identical chemical properties of all the is...

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  7. What is the reason for the slightly different physical properties of a...

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  8. Explain why, the atomic masses of many elements are in fractions and n...

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  9. Which of the following are isotopes and which are isobars ? Argon, D...

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  10. Hydrogen has three isotopes written as : .(1)^(1)H,.(1)^(2)H,.(1)^(3...

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  11. Given that the percentage abundance of the isotope .(10)^(20)N is 90 %...

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  12. What are isobars ? Explain with an example.

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  13. For the symbol H,D and T tabulate three sub-atomic particles found in ...

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  14. An element has Z = 7. What is the valency of the element ? Also name t...

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  15. (a) What are valence electrons ? Where are valence electrons situated ...

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  16. (a) What are isotopes ? Explain by giving an example (b) Give one si...

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  17. (a) What are radioactive isotopes ? Give two examples of radioactive i...

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  18. (a) Define valency of an element. What valency will be shown by an ele...

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  19. The mass number of two atoms X and Y is the same (40 each) but their a...

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  20. Which of the following statement is correct about the atom of an eleme...

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