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Question

Which of the following element is not an s-block element?

A
Sodium (Na)
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B
Aluminium (Al)
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C
Potassium (K)
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D
Lithium (Li)
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Solution

The correct option is B Aluminium (Al)
The subshell electronic configuration of given elements is given below.
Sodium (Na) - 1s22s22p63s1
Aluminium (Al) - 1s22s22p63s23p1
Potassium (K) - 1s22s22p63s23p64s1
Lithium (Li) - 1s22s1

If the element gets its new coming electron (differentiating electron) into 's' subshell, then it is classified as 's' block element.

If the element gets its new coming electron (differentiating electron) into 'p' subshell, then it is classified as 'p' block element.

Only aluminium has its last electron in p subshell. Therefore it is a p-block element.

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