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Question

An element X belongs to fourth period and fifteenth group of the periodic table. Which of the following statements is true?

A
It has a completely filled s-orbital and a partially filled d-orbital.
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B
It has completely filled s-and p-orbitals and a partially filled d-orbital.
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C
It has completely filled s-and p-orbitals and a half-filled d-orbital.
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D
It has a half-filled p-orbital and completely filled s-and d-orbitals.
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Solution

The correct option is C It has a half-filled p-orbital and completely filled s-and d-orbitals.
Group 15 has a valence shell electronic configuration of ns2np5 and period =4meansitsn=4$

thus electronic configuration of element X is 4s24p3

Elements of Group 15 and period 2 onwards are: N,P,As,Sb,Bi

Thus X is Arsenic (As) and has electronic configuration of: 1s22s22p63s23p63d104s24p3.

Thus, s and dorbitals are fully-filled and porbital is half-filled.

Hence, the correct option is D

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