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Which of the element is expected to have...

Which of the element is expected to have lowest first ionisation enthalpy

A

Sr

B

Al

C

Xe

D

S.

Text Solution

Verified by Experts

The correct Answer is:
A
S lies is the 3rd, As in the 4 th Sr and Xe lie in the fifth period. Except noble gases in general ionisation energy of the elements decreases as the serial number of the period increases. Thus ionisation enthalpies of S and as are higher than that of Sr but Xe being the noble gas has the highest enthlpy . thus Sr has the lowest ionisation enthalpy.
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