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Question

Which of the following elements has a big jump from its IE1 to IE2?

A
P
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B
Si
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C
Na
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D
Ne
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Solution

The correct option is C Na
A big jump in ionisation energy is found when an electron is ejected from a stable inert gas configuration.
The electronic configuration of the given elements are as follows:
P:[Ne]3s23p3
Si:[Ne]3s23p2
Na:[Ne]2s1
Ne:[He]2s22p6

When an electron is ejected from Na, it acquires a noble gas configuration, Na+:[Ne]. Therefore, the second electron requires a huge amount of energy for ejection. Hence, for sodium IE2>IE1.

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