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Question

Which of the following represents the correct order of increasing first ionization enthalpy for Ca, Ba, S, Se and Ar?



A

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B

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C

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D

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Solution

The correct option is C


Let's just write electronic configuration of all the elements in question.

Ca  1S22S22P63S23P64S2

Ba  [Xe]6S2

S  1S22S22P63S23P4

Se  [Ar]4S24P4

Ar  1S22S22P63S23P6

As we know,

Ionization energy    1Atomic Radius

As we know,

Ba > Ca > Se > S[Atomic Radius]

Therefore,

S > Se > Ca > Ba [IE1]

And if we have to remove one electron from a noble gas, then we have to apply large amount of energy because noble gases are very stable.

Therefore, the correct order will be

Ba < Ca < Se < S < Ar.

Too easy. Right!!!


Chemistry

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