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(a) What are isotopes ? Explain by givin...

(a) What are isotopes ? Explain by giving an example
(b) Give one similarity and one difference between a pair of isotopes
(c) Give the number of protons, neutrons and electrons per atom in the two isotopes of chlorine `._(17)^(35)Cl and ._(17)^(37)Cl`.

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What are isotopes ? Give one example .

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For chlorine Z=17,A =35.Give the number of protons ,electrons and neutrons in (i)chlorine atom ,(ii) chloride ion.

Give two differences between pure substances and mixture. Give one example of each.

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(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.

LAKHMIR SINGH & MANJIT KAUR-STRUCTURE OF ATOM-Exercise
  1. An element has Z = 7. What is the valency of the element ? Also name t...

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

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

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

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

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

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

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

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

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  10. Elements with valency 1 are

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

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

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

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

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

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

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

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

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

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

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