Home
Class 12
CHEMISTRY
While filling up electron in the atomic ...

While filling up electron in the atomic orbitals, 4s orbital is filled before 3d orbital but reverse happens during the ionisation of the atom. Explain why ?

Promotional Banner

Topper's Solved these Questions

  • D- AND F-BLOCK ELEMENTS

    PRADEEP|Exercise MATCHING TYPE QUESTIONS|9 Videos

  • D- AND F-BLOCK ELEMENTS

    PRADEEP|Exercise ASSERTION AND REASON TYPE QUESTIONS|5 Videos

  • D- AND F-BLOCK ELEMENTS

    PRADEEP|Exercise NCERT EXEMPLAR PROBLEMS(MULTIPLE CHOICE QUESTION -II)|10 Videos

  • CORDINATION COMPOUNDS

    PRADEEP|Exercise Important Questions|28 Videos

  • ELECTROCHEMISTRY

    PRADEEP|Exercise IMPORTANT QUESTIONS FOR BOARD EXAMINATION|25 Videos

Similar Questions

Explore conceptually related problems

While filling up of electrons in the atomic orbitals, the 4s orbital is filled before the 3d orbital but reverse happens during the ionisation of the atom. Explain why?

Filling of Electrons in Molecular Orbitals

4s orbitals has less energy than 3d orbital

Which of the following be the basis of entry of an electron is 4s orbital before 3d orbital ?

Out of 3d and 4s orbitals, which is filled first ?

Energy of electron in a orbit of H -atom is

Can 1s and 2s atomic orbitals from molecular orbitals

PRADEEP-D- AND F-BLOCK ELEMENTS-NCERT EXEMPLAR PROBLEMS(SHORT ANSWER QUESTIONS )
  1. Why does copper not replace hydrogen from acids?

    Text Solution

    |

  2. Why E^(-) values for Mn, Ni and Zn are more negative than expected?

    Text Solution

    |

  3. Why first ionisation enthalpy of Cr is lower than that of Zn?

    Text Solution

    |

  4. Transition elements show high melting points. Why?

    Text Solution

    |

  5. When Cu^(2+) ion is treated with KI, a white precipitate is formed. Ex...

    Text Solution

    |

  6. Out of Cu(2)Cl(2) and CuCl(2), which is more stable and why?

    Text Solution

    |

  7. When a brown compound of manganese (A) is treated with HCl it gives a ...

    Text Solution

    |

  8. Although fluorine is more electronegative than oxygen, but the ability...

    Text Solution

    |

  9. Although Cr^(3+) and Co^(2+) ions have same number of unpaired electro...

    Text Solution

    |

  10. Ionisation enthalpies of Ce, Pr and Nd are higher than Th, Pa and U. W...

    Text Solution

    |

  11. Although Zr belongs to 4d and Hf belongs to 5d transition series, but...

    Text Solution

    |

  12. Although +3 oxidation stae is thje characteristic oxidation state of ...

    Text Solution

    |

  13. Explain why does colour of KMnO(4) disappear when oxalic acids is adde...

    Text Solution

    |

  14. When orange solution containing Cr(2)O(7)^(2-) ion is treated with an ...

    Text Solution

    |

  15. A solution of KMnO(4) on reduction yields either a colourless solution...

    Text Solution

    |

  16. The second and third rows of transition elements resemble each other m...

    Text Solution

    |

  17. E^(@) of Cu is +0.34 V while that of Zn is -0.736 V. Explain.

    Text Solution

    |

  18. The halides of transition elements become more covalent with increasin...

    Text Solution

    |

  19. While filling up electron in the atomic orbitals, 4s orbital is filled...

    Text Solution

    |

  20. Reactivity of transition element decreases almost regularly from Sc t...

    Text Solution

    |