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Which one of the following is a correct ...

Which one of the following is a correct electronic configuration of sodium?

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(d) 2,8,1
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LAKHMIR SINGH & MANJIT KAUR-STRUCTURE OF ATOM-Exercise
  1. What are the limitations of Rutherford's model of the atom ?

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  2. Describe Bohr's model of the atom.

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  3. Compare all the proposed models of an atom given in this chapter.

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  4. Summarise the rules for writing of distribution of electrons in variou...

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  5. Define valency by taking examples of silicon and oxygen.

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  6. Explain with examples (i) Atomic number (ii) Mass number (iii) Isotope...

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  7. Na^(+) has completely filled K and L shells. Explain.

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  8. Bromine occurs in nature mainly in the form of two isotopes Br(35)^(79...

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  9. A sample of an element X contains two isotopes .(8)^(16)X and .(8)^(18...

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  10. If Z = 3, what would be the valency of the element? Also, name the ele...

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  11. Composition of the nuclei of two atomic species X and Y is given as un...

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  12. For the following statements, write T for true and F for false : (a)...

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

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  14. Isotopes of an element have : (a) the same physical properties (b)...

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  15. Number of valence electrons in Cl^(– ) ion are:

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

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  17. Complete the following table :

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  18. Imran and Rohan are best friends. They study in different schools in S...

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  19. Ravi was performing some experiements related to the laws of chemical ...

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  20. The students of class IX have made placards showing the symbols of som...

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