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If Z("eff") of sodium is .x. then Z("eff...

If `Z_("eff")` of sodium is .x. then `Z_("eff")` of calcium is :-

A

`x+0.35`

B

`x+0.65`

C

`x-0.35`

D

`x-0.65`

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The correct Answer is:
B
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Effective nuclear charge (Z_(eff)) is the net attractive force on electrons under consideration and is equal to: Z_(eff) = Z - sigma (nuclear charge - screening constant). Z_(eff) or sigma is calculated by Slater's formula, as given. If one electrons is present in the outermst orbit, there will be no screening in that orbital. Each electrons contribute, 0.35 (total electrons minus one electron) present in the outermost shell. A contribution of 0.85 for each electrons is taken in the (n - 1)th shell. Which of the following statement is wrong?

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ALLEN-Periodic Table -All Questions
  1. Which of the following is not correctly matched

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  2. An element whose IUPAC name is ununtrium (Uut) belongs to:

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  3. If Z("eff") of sodium is .x. then Z("eff") of calcium is :-

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  4. Lanthanoid contraction will not have any influence when we compare siz...

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  5. In which one of the following pairs the radius of the second species i...

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  6. Which of the following species will have the largest and the smallest ...

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  7. In which pair the first atom or ion is not larger than the second :-

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  8. Which one of the following statements is incorrect

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  9. Which of the following properties among halogens decreases from fluori...

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  10. Which of the following statement is incorrect ?

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  11. The correct values of ionization enthalpies (in kJ mol^(-1)) of Si, P,...

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  12. The second ionization energy is maximum for:

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  13. From the ground state electronic configurartion of the elements given ...

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  14. An elements have successive ionization enthalpies as 940 (first), 2080...

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  15. The incorrect statement among the following is

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  16. Ionisation energy depends upon:

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  17. The first ionization enthalpy (Delta(i)H) values of the third period e...

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  18. Which one of the following statements is incorrect in relation to ioni...

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  19. The IE1, IE2, IE3, IE4 and IE5 of an element are 7.1, 14.3, 34.5, 46....

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  20. Which of the following processes requires maximum energy

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