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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

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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.
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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……………

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

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ERRORLESS -CLASSIFICATION OF ELEMENTS AND PERIODIC PROPERTIES -Ordinary Thinking Objective Questions Ionisation Energy
  1. Which of the following elements will have the lowest first ionisation ...

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  2. Which of the following species has lowest ionisation potential?

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  3. The correct order in which the first ionisation potential increases is

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

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  5. Ionisation energy in group I-A varies in the decreasing order as

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  6. The second ionisation potential of an element M is the energy required...

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  7. Arrange S, P and As in order of increasing ionisation energy.

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  8. Which ionisation potential (IP) in the following equations involves th...

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  9. Which of the following has highest ionisation energy ?

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  10. Which one of the following elements has the highest ionisation energy?

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  11. Which of the following electrons should generally have the highest val...

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  12. The first ionisation energy of beryllium is more than that of boron be...

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  13. A rarr A^(+)+e,E(1) and A^(+) rarr A^(2+)+e,E(2). The energy requried ...

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

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  15. Choose the correct statement

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  16. The ionisation energy of an element is

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  17. Assertion :First ionization energy is lower than oxygen. Reason :Ac...

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  18. Assertion: E^(@) for Mn^(3+)//Mn^(2+) is more positive than Cr^(3+)//C...

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  19. Assertion : Ionisation enthalpy is always negative. Reason : Energy...

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  20. Assertion: Ionisation potential across the period is NaltAlltMgltSi. ...

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