Home
Class 11
CHEMISTRY
Generally, the first ionisation energy i...

Generally, the first ionisation energy increases along a period. But there are some exceptions one which is not an exception is

A

N and O

B

Na and Mg

C

Mg and Al

D

Be and B

Text Solution

Verified by Experts

The correct Answer is:
B
Be,N and Mg have higher values than expected, this is due to stable configurations of these elements. Be and Mg have fully-filled orbitals, in nitrogen 2p- orbitals are half-filled.
Promotional Banner

Topper's Solved these Questions

  • CLASSFICATION OF ELEMENTS AND PERIODICITY IN PROPERTIES

    ERRORLESS|Exercise NCERT BASED QUESTIONS (Electron Affinity)|21 Videos

  • CLASSFICATION OF ELEMENTS AND PERIODICITY IN PROPERTIES

    ERRORLESS|Exercise NCERT BASED QUESTIONS (Electronegativity)|18 Videos

  • CLASSFICATION OF ELEMENTS AND PERIODICITY IN PROPERTIES

    ERRORLESS|Exercise NCERT BASED QUESTIONS (Atomic and Ionic Radii)|39 Videos

  • CHEMICAL EQUILIBRIUM

    ERRORLESS|Exercise ASSERTION & REASON |12 Videos

  • ENVIRONMENTAL CHEMISTRY

    ERRORLESS|Exercise ASSERTION & REASON|7 Videos

Similar Questions

Explore conceptually related problems

The ionisation energy (IE_(1)) of an atom is defined as the energy needed to remove an electron from gaseous atom in its ground state. The 2nd ionisation energy (IE_(2)) is the additional energy needed to remove the 2nd electron and so on. The successive ionisation energy of any species is increasing always. Generally, the first ionisation energy increase along a period. But there are some exceptions. One which is not an exception is:

Generally, the first ionization energy increases along a period. But there are some exceptions. One which is NOT an exception is……………

Some Exceptional cases

Why does the first ionisation energy increase as we go from left to right along a given period of periodic table?

The rate of a reaction can be increased in general by all the factors except

ERRORLESS-CLASSFICATION OF ELEMENTS AND PERIODICITY IN PROPERTIES -NCERT BASED QUESTIONS (Ionisation Energy)
  1. In a given shell, the order of screeing effect is

    Text Solution

    |

  2. Among the following, the third ionisation energy is highest for

    Text Solution

    |

  3. Generally, the first ionisation energy increases along a period. But t...

    Text Solution

    |

  4. Which of the element is expected to have lowest first ionisation entha...

    Text Solution

    |

  5. The first ionisation potential of Na is 5.1eV. The value of electrons ...

    Text Solution

    |

  6. Amongest Be, B, Mg and Al, the second ionization potential is maximum ...

    Text Solution

    |

  7. In which of the following options the order of arrangement does ...

    Text Solution

    |

  8. One among the following is the incrorrect order of increasing ionisati...

    Text Solution

    |

  9. A sudden large jump between the values of second and third ionisation ...

    Text Solution

    |

  10. Which element having the following electronic configuration has minimu...

    Text Solution

    |

  11. The correct order of the second ionisation potential of carbon, nitrog...

    Text Solution

    |

  12. The correct match of contents in Column I with those in Column II is

    Text Solution

    |

  13. One electron species having ionization enegry of 54.4 eV is

    Text Solution

    |

  14. Amongst the following elements whose electronic configuration are ...

    Text Solution

    |

  15. The incorrect statement among the following is

    Text Solution

    |

  16. The first ionization energy of oxygen is less than that of nitrogen. W...

    Text Solution

    |

  17. Which of the following explanation is best for not placing hydrogen in...

    Text Solution

    |

  18. Which of the following order is wrong-

    Text Solution

    |

  19. Among the following transition elements, pick out the element/elements...

    Text Solution

    |

  20. The decreasing order of the first ionization energy (in kJ mol^(-1)) o...

    Text Solution

    |