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The correct order in which the first ion...

The correct order in which the first ionzation enthalpy increases is

A

`Be, Na, K`

B

`Na, K, Be`

C

`K, Na, Be`

D

`K, Be, Na`

Text Solution

Verified by Experts

The correct Answer is:
C
In general, the ionization enthalpy increases across the period on account of increase of `Z_(eff)` but decreases down the group on account of increase of atomic size.

Thus, the correct order is
`Be(899) gt Na (496) lt K (419)`
The very high ionization enthalpy of `Be` is due to its very small size and also due to its stable configuration `(1s^(2)2s^(2))`.
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Knowledge Check

  • The correct order in which the first ionisation potential increases is

    A
    K, Be, Na
    B
    Be, Na, K
    C
    Na, K, Be
    D
    K, Na, Be

  • The correct order of the first ionization enthalpies is :

    A
    Mn lt Ti lt Zn lt Ni
    B
    Ti lt Mn lt Ni lt Zn
    C
    Zn ltNi lt Mn lt Ti
    D
    Ti lt Mn lt Zn lt Ni

  • The correct order of increasing first ionization energy is

    A
    `Ca lt K lt Ne lt P lt F`
    B
    `F lt Ca lt n e lt P lt K`
    C
    `K lt Ca lt Plt F lt Ne`
    D
    `Ne lt F lt P lt Ca lt K`

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