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JEE Main 201910 JanuaryEvening Shift

Exam: JEE Main
Year: 2019
Date: 10 January
Shift: Evening Shift
Subject: Chemistry
Chapter: Structure of Atom

JEE Main 2019 · 10 January · Evening Shift · Chemistry · Structure of Atom

The 71 ^ st electron of an element X with an atomic number of 71...

The

{71}^{st}

electron of an element

X

with an atomic number of

71

enters the orbital:

Options

A $5d$
B $4f$
C $6p$
D $6s$

Correct answer

A. $5d$

Step-by-step solution

{}_{71}Lu: \left[Xe\right]4{f}^{14}6{s}^{2}5{d}^{1}

(The last electron enters

5d

orbital)

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