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Which one of the following is a correct ...

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

A

2,8

B

8,2,1

C

2,1,8

D

2,8,1

Text Solution

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The correct Answer is:
D
2,8,1
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NAND LAL PUBLICATION-STRUCTURE OF THE ATOM -EXERCISES
  1. Describe Bohr's model of atom.

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

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  3. Summarize the rules for writing of distribution of electrons in variou...

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

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  5. Define atomic number.

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  6. Explain with examples : Mass number

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  7. Explain with examples : Isotopes

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  8. Explain with examples : Isobars.

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  9. What are isotopes ? Give two uses of isotopes. Name the isotopes of hy...

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  10. Na^+ has completely filled K and L shells. Explain.

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  11. If bromine atom is in the form of say isotopes "35^79Br (49.7%) and "...

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  12. The average atomic mass of a sample of an element X is 16.2 u, what ar...

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  13. IfZ= 3, what would be the valency of the element ? Also, name the elem...

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  14. Composition of the nuclei of two atomic species X and Y are given as u...

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  15. For the following statements write T for true and F for false . (a) ...

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  16. Rutherford's alpha-particle scattering experiment was responsible for ...

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  17. Isotopes of an element have

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  18. Number of valence electrons in Cl^(-) ion are :

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

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  20. Complete the following table:

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