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The first ionization energy of oxygen is...

The first ionization energy of oxygen is less than that of nitrogen. Which of the following is the correct reason for this observation?

A

Higher electronegativity of oxygen than nitrogen

B

Greater effective nuclear charge of oxygen than nitrogen

C

Lesser atomic size of oxygen than nitrogen

D

Greater inter electron repulsion between two electrons in the same `p`-orbital counter balances the increase in effective nuclear charge on moving from nitrogen to oxygen

Text Solution

Verified by Experts

The correct Answer is:
D
Another reason is that after losing one of the `p` electrons, oxygen acquires stability in the form of excatly halffull `p `subshell:
`O(1s^(2)2s^(2)2p^(4))rarr O^(+) (1s^(2)2s^(2)2p^(3))+e^(-)`
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Knowledge Check

  • The first ionisation energy of oxygen is less than that of nitrogen. Which of the following is correct reason for this observation ?

    A
    Lesser effective nuclear charge of oxygen than nitrogen
    B
    Lesser atomic size of oxygen than nitrogen
    C
    Greater inter electron repulsion between two electrons in the same p-orbital counterbalances the increase in effective nuclear charge on moving from nitrogen to oxygen
    D
    Greater effective nuclear charge on oxygen than nitrogen

  • The first ionisation energy of oxygen is less than that of nitrogen which of the following is correct reason for this observation?

    A
    Lesser effective nuclear charge of oxygen that nitrogen
    B
    lesser atomic size of oxygen than nitrogen
    C
    greater inter electron repulsion between two electrons in the same p orbital counter balances the increase in effective nuclear charge on moving from nitrogen to oxygen
    D
    greater effective nuclear charge on oxygen than nitrogen

  • The first ionisation energy of xygen is less than that of nitrogen which of the following statements is correct reason for this observation? I.Lesser effective nuclear charge of oxygen than nitrogen II.Lesser atomic size of oxygen than nitroigen III.Greater inter electronic repulsion between two electrons in the same p orbital counter balances the increase in effective nuclear charge on moving from nitrogen to oxygen choose the correct option

    A
    only I
    B
    II and III
    C
    I and II
    D
    Only III

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