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(a) Describe Thomson's model of the atom...

(a) Describe Thomson's model of the atom. Which subatomic particle was not present in Thomson's model of the atom?
(b) The mass number of an element is 18. It contains 7 electrons. What is the number of protons and neutrons in it? What is the atomic number of the element?

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The correct Answer is:
(b) `7 ; 11 ; 7`
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LAKHMIR SINGH & MANJIT KAUR-STRUCTURE OF ATOM-Exercise
  1. Fill in the following blanks :

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  2. Fill in the following blanks in respect of an atom of an element :

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  3. (a) Describe Thomson's model of the atom. Which subatomic particle was...

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  4. (a) Describe the Rutherford's model of an atom. State one drawback of ...

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  5. (a) Describe Bohr's model of the atom. How did Neils Bohr explain the ...

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  6. (a) What is mean by (i) atomic number, and (ii) mass number, of an ele...

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  7. Rutherford's alpha particle scattering experiment led to the discovery...

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  8. Which one of the following is a correct electronic configuration of so...

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  9. Which subatomic particle is not present in an ordinary hydrogen atom ?

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  10. The subatomic particle called electron was discovered by :

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  11. Which of the following represents the correct electron distribution in...

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  12. The correct electronic configuration of a chloride ion is :

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  13. Goldstein's experiments which involved passing high voltage electricit...

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  14. The number of electrons in the atom of an element X is 15 and the numb...

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  15. The ion of an element has 3 positive charges. The mass number of atom ...

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  16. The first model of an atom was given by

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  17. Which of the following statement is always correct?

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  18. From the symbol .(15)^(31)P, state : (i) mass number of phosphorus,...

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  19. The atom of an element X has 7 electrons in its M shell (a) Write th...

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  20. An atom of element E contains 3 protons, 3 electrons and 4 neutrons : ...

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