Which of the following represents the co...

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

`Ca lt Ba lt S lt Se lt Ar`

`Ca lt S lg Ba lt Se lt Ar`

`S lg Se lt Ca lt Ba lt Ar `

`Ba lt Ca lt Se lt S lt Ar`

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The correct Answer is:

The ionization enthalpy decreases from top to bottom in a group (i.e., `Delta_(i) H_(1) Ca gt Delta_(i) H_(1) Ba : Delta_(i) H_(1) S gt Delta_(i) H_(1) Se)` and increases from left to right in a period (i.e., `Delta_(I) H_(1) S lt Delta_(i) H_(1) Ar)`. Thus the `Delta_(i) H_(1)` of the five elements increases in teh order :
`Ba lt Ca lt Se lt S lt Ar `,i.e., option (d) is correct.

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

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