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Question

An element (X) belongs to fourth period and fifteenth group of the periodic table. Which one of the following is true regarding the outer electronic configuration of (X)?
It has:

A
Partially filled d-orbital and completely filled s-orbital
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B
Completely filled s-orbital and completely filled p-orbital
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C
Completely filled s-orbital and half filled p-orbital
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D
Half-filled d-orbital and completely filled s-orbital
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Solution

The correct option is C Completely filled s-orbital and half filled p-orbital
The element belongs to fourth period and fifteenth group of the periodic table is Arsenic (As).

The electronic configuration of As is 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p3

So, the element (X) has completely filled s and d-orbitals and half-filled p-orbital.

Hence, option (c) is the correct answer.

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