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(a) What are radioactive isotopes ? Give...

(a) What are radioactive isotopes ? Give two examples of radioactive isotopes
(b) Give any two uses of ratioactive isotopes
(c) An element Z contains two naturally occuring isotopes `._(17)^(35) Z and ._(17)^(37)Z`. If the average atomic mass of this element be 35.5 u, calculate the percentage of two isotopes.

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The correct Answer is:
(c) 75%, 5%
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LAKHMIR SINGH & MANJIT KAUR-STRUCTURE OF ATOM-Exercise
  1. (a) What are valence electrons ? Where are valence electrons situated ...

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

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

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

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

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

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  7. There are two species represented as ""^(35)Cl and ""^(37)Cl. Which of...

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  8. The radioactive isotope used in the treatment of cancer is :

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  9. Elements with valency 1 are

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  10. In a sample of ethyl ethanote (CH(3)COOC(2)H(5)) the two oxygen atoms ...

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  11. Which of the following elements does not exhibit electrovalency ?

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  12. The number of valence electrons in a graphite atom is :

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  13. The atomic numbers of four elements A,B,C and D are 12,13,15 and 3 res...

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  14. The number of valence electrons in a sulphide ion, S^(2-) is :

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  15. For an element, Z = 9. The valency of this element will be :

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  16. Four elements W,X,Y and Z contain 8,11,9 and 17 protons per atom respe...

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  17. The four atomic species can be represented as follows. Out of these, t...

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  18. There are four elements P,Q,R and S having atomic numbers of 4,18,10 a...

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  19. The atomic number of an element X is 8 and that of element Y is 4. Bot...

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  20. The isotopes of an element contain :

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