Which of thefollowingrepresentsthe correctorderof increasingfirstionizationenthalpy for Ca, Ba , S, Se, and Ar ?

Which of thefollowingrepresentsthe correctorderof increasingfirstioniz

1.	Which of thefollowingrepresentsthe correctorderof increasingfirstionizationenthalpy for Ca, Ba , S, Se, and Ar ?
Answer» `Ca lt Ba lt S lt Se lt Ar` `Ca LTS lg Ba lt Se lt Ar` `S lg Se lt Ca lt Ba lt Ar ` `Ba lt Ca lt Selt S lt Ar` Solution :Theionizationenthalpydecreases from TOP to bottomina group(i.e.,`Delta_(i) H_(1) Ca gt Delta_(i)H_(1) Ba :Delta_(i)H_(1) S gtDelta_(i) H_(1) Se)`and increasesfrom leftto rightin a PERIOD (i.e., `Delta_(I) H_(1) S lt Delta_(i)H_(1) Ar)`. Thusthe `Delta_(i) H_(1)` of thefive elementsincreasesin teh ORDER : `Ba lt Ca lt Se lt S lt Ar `,i.e., option (d) is correct.