The correct order of size of the given species is: 

1.  I > I> I+

2.  I> I> I

3.  I > I> I-

4.  I> I > I+

Subtopic:  Atomic Size |
 94%
From NCERT
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The correct statement about radius is :

1. Radius increases during cation and anion formation.
2. Radius increases during anion formation and decreases during cation formation.
3. Radius decreases in cation as well as anion.
4. Radius decreases during anion formation and increases during cation formation.

Subtopic:  Atomic Size |
 91%
From NCERT
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The correct order of the decreasing ionic radii among the following isoelectronic species is:

1. Ca2+>K+>S2->Cl-

2. Cl->S2->Ca2+>K+

3. S2->Cl->K+>Ca2+

4. K+>Ca2+>Cl->S2-

Subtopic:  Atomic Size |
 87%
From NCERT
AIPMT - 2010
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Match the following isoelectronic species in column I and column II : 

Column I Column II
i. F- a. Br-
ii. Ar b.  Si2+
iii. Mg c. O2-
iv. Rb+ d. S2-
 
i ii iii iv
1. b c a d
2. c b a d
3. c d b a
4. b c d a
Subtopic:  Atomic Size |
 86%
From NCERT
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Among the following species, the smallest ion is : 

1. Na+ 2. F-
3. O2- 4. N3-
Subtopic:  Atomic Size |
 84%
From NCERT
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The correct sequence of increasing radii is - 

1. Ar < K+ < Ca2+ 2. Ca2+ < Ar < K+
3. Ca2+ < K+ < Ar 4. K< Ar < Ca2+
Subtopic:  Atomic Size |
 84%
From NCERT
NEET - 2015
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In alkaline earth metals, the properties, from the following, that will increase from Be to Ba are-

(i) Atomic radius       
(ii) Ionisation energy       
(iii) Nuclear charge

1. (i) and (ii) 2. (i) and (iii)
3. (ii) and (iii) 4. (i), (ii), and (iii)
Subtopic:  Atomic Size |
 81%
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A common trend in both groups I and II elements in the periodic table, as the atomic number increases, is :

1. Oxidizing power increases

2. Atomic radius increases

3. Maximum valency increases

4. Reactivity with water decreases

Subtopic:  Atomic Size |
 81%
From NCERT
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Increasing order of ionic radii and decreasing order of number of protons of the given isoelectronic species is:-

1. Ca+2, K+, Cl-, S-2

2. Cl-, Ca+2, K+, S-2

3. S-2, Cl-, Ca+2, K+

4. None of the above

Subtopic:  Atomic Size |
 81%
From NCERT
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The correct order of ionic radii is:

1. H->H+>H 
2. Na+>F->O2-
3. F->O2->Na+
4. N3->Mg2+>Al3+

Subtopic:  Atomic Size |
 80%
From NCERT
AIPMT - 2014
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