AIIMS 2016

Exam: AIIMS
Year: 2016
Subject: Chemistry
Chapter: Classification of Elements and Periodicity in Properties

AIIMS 2016 · Chemistry · Classification of Elements and Periodicity in Properties

An element (X) belongs to fourth period and fifteenth group of the...

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

Options

Apartially filled $d$ orbitals and completely filled $s$ orbital
Bcompletely filled $s$ orbital and completely filled $p$ orbitals
Ccompletely filled $s$ orbital and half-filled $p$ orbitals
Dhalf-filled $d$ orbitals and completely filled $s$ orbital.

Correct answer

C. completely filled $s$ orbital and half-filled $p$ orbitals

Step-by-step solution

The electronic configuration of

(X)

can be written as

X=1 s^2 2 s^2 2 p^6 3 s^2 3 p^6 4 s^2 3 d^{10} 4 p^3

So, element

(X)

has completely filled

s

and

d

orbitals and half filled

p

orbitals.

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