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Q. No.
Which of the following sets contains isoelectronic species?
1. \(\mathrm{C}_2^{2-}, \mathrm{NO}^{+}, \mathrm{CN}^{-}, \mathrm{O}_2^{2+}\)
2. \(\mathrm{CO}, \mathrm{NO}, \mathrm{O}_2, \mathrm{CN}\)
3. \(\mathrm{CO}_2, \mathrm{NO}_2, \mathrm{O}_2, \mathrm{~N}_2 \mathrm{O}_5\)
4. \(\mathrm{CO}, \mathrm{CO}_2, \mathrm{NO}, \mathrm{NO}_2\)
Subtopic:  Electronic Configuration |
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Level 1: 80%+
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Which of the following have isoelectronic structure? 
(a) \(\mathrm{CH}_3^{+}\) (b) \(\mathrm{H}_3 \mathrm{O}^{+}\)
(c) \(\mathrm{CH}_3^{-}\) (d) \(\mathrm{NH}_3\)

1. a, b, c
2. b, c, d
3. a, c
4. None of the above
Subtopic:  Electronic Configuration |
 92%
Level 1: 80%+
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The element with atomic number 49 is Indium (In). It belongs to:
Group Period
1. 13 5
2. 6 14
3. 13 7
4. 8 5
Subtopic:  Electronic Configuration |
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Which ion is isoelectronic with Be²⁺?

1. H+ 2. Li+
3. Na+ 4. Mg2+
Subtopic:  Electronic Configuration |
 92%
Level 1: 80%+
AIPMT - 2014
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What is the group number and valency of the element having atomic number 119, respectively?

1. Valency =2 & Group = IB

2. Valency =2 & Group = IA

3. Valency =1 & Group = IB

4. Valency =1 & Group = IA

Subtopic:  Electronic Configuration |
 91%
Level 1: 80%+
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How many of the following given atomic numbers have a noble gas configuration?
 \(56, 57, 70, 80, 24\)

1. 0 
2. 4 
3. 6 
4. 9
Subtopic:  Electronic Configuration |
 90%
Level 1: 80%+
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Palladium (Pd) has an exceptional outer electronic configuration of \(4 d^{10} 5 s^0\). It belongs to:

1. \(4^{\text {th }}\)period, group 11 
2. \(5^{\text {th }}\) period, group 10
3. \(6^{\text {th }}\)period, group 9
4. \(3^\text {rd}\) period, group 16
Subtopic:  Electronic Configuration |
 89%
Level 1: 80%+
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Select the correct match:
Column-I
(Electronic Configuration)
 Column-II
(Corresponding group
and block)
\(P=n s^2 n p^4\) (A) Group no = 17, p-block
\(Q=(n-1) d^2 n s^2 \) (B) Group no = 4, d-block
\(R=(n-2) f^7(n-1) d^1 n s^2\) (C) Group no = 16, p-block
\(S=(n-1) d^{10} n s^2 n p^5 \) (D) Group no =3, f-block
1. (P-A),(Q-B),(R-C),(S-D)
2. (P-C),(Q-B),(R-D),(S-A)
3. (P-A),(Q-C),(R-B),(S-D)
4. (P-B),(Q-D),(R-C),(S-A)
Subtopic:  Modern Periodic Table & Periodicity | Electronic Configuration |
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Match the name of elements given in list-I with the corresponding electronic configuration given in list-II and select the correct answer using the codes given below:

List-I

(element)

List-II

(electronic configuration)
(a)

Gallium

 1. 

1s2 2s2 2p6 3s2 3p6 4s2 3d1
(b)

Vanadium

 2.

1s2 2s2 2p6 3s2 3p6 4s2 3d10
(c)

Zinc

 3.

1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p1
(d)

Scandium

 4.

1s2 2s2 2p6 3s2 3p6 4s2 3d3

Codes :

 (a) (b)  (c)  (d)
1. 2 1 3 4
2.  3 4 1 2
3. 3 4 2 1
4.  1 2 4 3
Subtopic:  Electronic Configuration |
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Which of the following species will be isoelectronic with each other?

(i) F– (ii) Ar (iii) Mg2+ (iv) Rb+

1. i and ii

2. i and iv

3. i and iii

4. ii and iv

Subtopic:  Electronic Configuration |
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