Q.

Element that has the highest first ionisation energy among the following is

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a

Ca

b

Mg

c

Al

d

Si

answer is D.

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Detailed Solution

IP1 of Ca < MgIP1 of Al < SiIP1 of Al < Mg < SiIP1 of Ca < Al < Mg < SIP value of 3rd period elements are much lesser than 2nd peruiod elements of the same group (or) neighbouring group.
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