Q.

Consider the elements Mg, Al, S, P and Si, the correct increasing order of their first ionisation enthalpy is :

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a

Mg<Al<Si<S<P

b

Mg<Al<Si<P<S

c

Al<Mg<S<Si<P

d

Al<Mg<Si<S<P

answer is D.

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Detailed Solution

In general, from left to right in a period, ionisation enthalpy increases due to an increase in effective nuclear charge.

But due to extra stability of half-filled (P) and full-filled electronic configuration (Mg), required ionisation enthalpy is more from neighbouring elements. i.e., first ionisation enthalpy order is

Al<Mg<Si<S<P

Hence, the required answer is D.

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