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Identify the incorrect statement from the following:

1.	The IUPAC name of the element with atomic number 107 is Unnilseptium.
2.	The largest and the smallest species among $\text{Mg}$, $\text{Mg}^{2+}$, $\text{Al}$ and $\text{Al}^{3+}$ are $\text{Al}$ and $\text{Mg}^{2+}$, respectively.
3.	The similarity in behaviour of $\text{Li}$ with $\text{Mg}$ is referred to as 'diagonal relationship'.
4.	The oxidation state and covalency of $\text{Al}$ in $[\text{AlCl}(\text{H}_2\text{O})_5]^{2+}$ are 3 and 6 respectively.

Subtopic: Modern Periodic Table & Periodicity | Atomic Size |

72%

Level 2: 60%+

NEET - 2026

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Please attempt this question first.

Q2:

The correct decreasing order of atomic radii (pm) of Li, Be, B and C is:

1. Be > Li > B > C
2. Li > Be > B > C
3. C > B > Be > Li
4. Li > C > Be > B

Subtopic: Atomic Size |

81%

Level 1: 80%+

NEET - 2024

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Q3:

The element expected to form the largest ion to achieve the nearest noble gas configuration is:

1.	Sodium(Na)	2.	Oxygen(O)
3.	Fluorine(F)	4.	Nitrogen(N)

Subtopic: Atomic Size |

56%

Level 3: 35%-60%

NEET - 2023

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Q4:

Match List-I (Elements) with List-II (Atomic radii (pm)):

	List-I Elements		List-II Atomic radii (pm)
(a)	Oxygen ($O$)	(i)	88
(b)	Carbon ($C$)	(ii)	74
(c)	Boron ($B$)	(iii)	66
(d)	Nitrogen ($N$)	(iv)	77

Choose the correct answer from the options given below:

	(a)	(b)	(c)	(d)
1.	(ii)	(i)	(iv)	(iii)
2.	(iv)	(iii)	(ii)	(i)
3.	(i)	(iv)	(iii)	(ii)
4.	(iii)	(iv)	(i)	(ii)

Subtopic: Atomic Size |

74%

Level 2: 60%+

NEET - 2022

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Q5:

The species Ar, K⁺ and Ca²⁺ contain the same number of electrons. In which order do their radii increase?
1. Ar < K⁺< Ca²⁺
2. Ca²⁺ < Ar < K⁺
3. Ca²⁺< K⁺< Ar
4. K⁺ < Ar < Ca²⁺

Subtopic: Atomic Size |

84%

Level 1: 80%+

NEET - 2015

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Q6:

The correct order of ionic radii is:

1. $H^{-} > H^{+} > H$
2. $N a^{+} > F^{-} > O^{2 -}$
3. $F^{-} > O^{2 -} > N a^{+}$
4. $N^{3 -} > M g^{2 +} > A l^{3 +}$

Subtopic: Atomic Size |

82%

Level 1: 80%+

AIPMT - 2014

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Q7:

The correct order of the decreasing ionic radii among the following isoelectronic species is:

1. $C a^{2 +} > K^{+} > S^{2 -} > C l^{-}$

2. $C l^{-} > S^{2 -} > C a^{2 +} > K^{+}$

3. $S^{2 -} > C l^{-} > K^{+} > C a^{2 +}$

4. $K^{+} > C a^{2 +} > C l^{-} > S^{2 -}$

Subtopic: Atomic Size |

88%

Level 1: 80%+

AIPMT - 2010

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Q8:

Among the elements Ca, Mg, P and Cl, the correct order of increasing atomic radii is:
1. Cl < P < Mg < Ca
2. P < Cl < Ca < Mg
3. Ca < Mg < P < Cl
4. Mg < Ca < Cl < P

Subtopic: Atomic Size |

80%

Level 1: 80%+

AIPMT - 2010

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Q9:

Identify the correct order of the size of the following:

1. $C a^{2 +} < K^{+} < A r < S^{2 -} < C l^{-}$

2. $C a^{2 +} < K^{+} < A r < C l^{-} < S^{2 -}$

3. $A r < C a^{2 +} < K^{+} < C l^{-} < S^{2 -}$

4. $C a^{2 +} < A r^{+} < K^{+} < C l^{-} < S^{2 -}$

Subtopic: Atomic Size |

83%

Level 1: 80%+

AIPMT - 2007

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Q10:

Ionic radii are:

1.	Inversely proportional to the square of effective nuclear charge.
2.	Directly proportional to the effective nuclear charge.
3.	Directly proportional to the square of effective nuclear charge.
4.	Inversely proportional to the effective nuclear charge.

Subtopic: Atomic Size |

75%

Level 2: 60%+

AIPMT - 2004

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1.	The IUPAC name of the element with atomic number 107 is Unnilseptium.
2.	The largest and the smallest species among \(\text{Mg}\), \(\text{Mg}^{2+}\), \(\text{Al}\) and \(\text{Al}^{3+}\) are \(\text{Al}\) and \(\text{Mg}^{2+}\), respectively.
3.	The similarity in behaviour of \(\text{Li}\) with \(\text{Mg}\) is referred to as 'diagonal relationship'.
4.	The oxidation state and covalency of \(\text{Al}\) in \([\text{AlCl}(\text{H}_2\text{O})_5]^{2+}\) are 3 and 6 respectively.

	List-I Elements		List-II Atomic radii (pm)
(a)	Oxygen (\(O\))	(i)	88
(b)	Carbon (\(C\))	(ii)	74
(c)	Boron (\(B\))	(iii)	66
(d)	Nitrogen (\(N\))	(iv)	77

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