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Q.

Which represents the correct order of first ionisation potential of third period elements?

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a

Na > Mg>Al > Si

b

Na < Mg < At < Si

c

Na < Si

d

Na < Al < Mg < Si

answer is D.

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Detailed Solution

Generally, ionisation potential increases, as we move from left to right in a period. However the ionisation Potential of II group elements is higher than that of the III A group elements. This is because of the fully-filled s-orbitals in II group elements.Hence, the correct order of ionisation potential is
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