An element \( X \) belongs to fourth period and fifteenth group of the periodic table. Which one...

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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 \( d \)-orbitals and completely filled \( s \)-orbitals
(b) Completely filled \( s \)-orbital and completely filled \( p \)-orbitals
(c) Completely filled s-orbital and half-filled \( p \)-orbitals
(d) Half-filled \( d \)-robitals and completely filled \( s \)-orbitals
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