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Why is electronic configuration 1s^2 2s...

Why is electronic configuration `1s^2 2s^2 2p^6 3s^2 3p^6 3d^4 4s^2 ` not correct for the ground state of Cr(24) ?

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Correct electronic onfiguration for Cr(24) is `1s^2 because half-filled (30) configuration is more stable.
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KALYANI PUBLICATION-d- AND- f- BLOCK ELEMENTS-EXERCISE (PART-II) (DESCRIPTIVE QUESTIONS)(VERY SHORT ANSWER QUESTIONS)
  1. Why is Pt(IV) more stable than Ni(IV).

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  2. K2 Pt Cl6 is well known compound while corresponding Ni compound is n...

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  3. Why is electronic configuration 1s^2 2s^2 2p^6 3s^2 3p^6 3d^4 4s^2 n...

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  4. How does the ionic/covalent character of the compounds of a transition...

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  5. Why do transition elements have high value of hydration enthalpy?

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  6. Why Fe^(2+) has smaller radius than Mn^(2+) ?

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  7. Why do most transition metal ions exhibit paramagnetism ?

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  8. How is the magnetic moment of a species related to the number of unpai...

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  9. The electronic configuration of Co^(2+) and Cu^(2+) is d^7 and d^(9) r...

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  10. Which of the following is paramagnetic ? Sc^(3+) (Z=21),Cu^(+)(Z=29)

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  11. Why is Ti^(2+) ion paramagnetic ?

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  12. One unpaired electron in an atom contributes a magnetic moment of 1.1 ...

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  13. Why do transition elements show variable oxidation states?

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  14. Why are complex ions readily formed when water molecules react with th...

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  15. Arrange the following in increasing order of basic character: MnO, ...

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  16. Arrange the following in increasing order of acidic character: CrO,...

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  17. What happens when KMnO4 is heated ?

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  18. What is Baeyer's reagent ?

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  19. Why is KMnO4 kept in dark bottles ?

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  20. Why is HCl not used to acidify a permanganate solution in volumetric e...

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