NEET Chemistry Classification of Elements and Periodicity in Properties Atomic Radius MCQs

    Prepare for NEET Chemistry Classification of Elements (Atomic Radius) with MCQs & PYQs on NEET.GUIDE. Access free practice, previous year questions, and expert help to understand atomic size trends across periods and groups.

    NEET Questions / Chemistry / Classification of Elements and Periodicity in Properties / Atomic Radius

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    Medeleev'S Periodic Table
    Position Of Element In P.T
    Iupac Names
    S,P,D,F-Block
    Types Of Elements
    Atomic Radius
    Ionisation Energy
    Electron Affinity
    Nature Of Oxides
    Electro Negativity, Electro Positivity, Valency
    Introduction
    1.

    Which of the following correctly explains the observed trend in atomic radii within the lanthanide series (from La to Lu)?

    A

    Increase in atomic radii due to increasing number of electrons.

    B

    Lanthanide contraction due to poor shielding of nuclear charge by 4f electrons.

    C

    Constant atomic radii due to similar electronic configurations.

    D

    Decrease in atomic radii due to increasing electronegativity.

    Question Tags

    📚 Subject:Chemistry
    📑 Chapter:Classification of Elements and Periodicity in Properties
    🎯Topic:Atomic Radius
    🎓 Ncert Level:Understanding
    🎯Difficulty :Hard
    ⚡ Time Required :1 mins
    🔄Ncert Concepts :Atomic Radius, Lanthanide Contraction, Shielding Effect
    2.

    Consider the isoelectronic species S2−S^{2-}, Cl−Cl^-, ArAr, K+K^+, and Ca2+Ca^{2+}. Arrange them in increasing order of their ionic radii.

    A

    S2−<Cl−<Ar<K+<Ca2+S^{2-} < Cl^- < Ar < K^+ < Ca^{2+}

    B

    Ca2+<K+<Ar<Cl−<S2−Ca^{2+} < K^+ < Ar < Cl^- < S^{2-}

    C

    Ar<K+<Ca2+<Cl−<S2−Ar < K^+ < Ca^{2+} < Cl^- < S^{2-}

    D

    K+<Ca2+<Ar<S2−<Cl−K^+ < Ca^{2+} < Ar < S^{2-} < Cl^-

    Question Tags

    📚 Subject:Chemistry
    📑 Chapter:Classification of Elements and Periodicity in Properties
    🎯Topic:Atomic Radius
    🎓 Ncert Level:Application
    🎯Difficulty :Hard
    ⚡ Time Required :1 mins
    🔄Ncert Concepts :Atomic Radius, Ionic Radius, Isoelectronic Species
    3.

    Which factor has the LEAST significant influence on the atomic radius of an element?

    A

    The effective nuclear charge

    B

    The number of electron shells

    C

    The number of neutrons in the nucleus

    D

    The shielding effect of inner electrons

    Question Tags

    📚 Subject:Chemistry
    📑 Chapter:Classification of Elements and Periodicity in Properties
    🎯Topic:Atomic Radius
    🎓 Ncert Level:Analyzing
    🎯Difficulty :Hard
    ⚡ Time Required :1 mins
    🔄Ncert Concepts :Atomic Radius, Nuclear Charge, Shielding Effect
    4.

    Down Group 13, the atomic radii generally increase. However, the difference in atomic radii between Ga and Al is smaller than expected. This anomaly is primarily attributed to:

    A

    The increased shielding effect of d-electrons

    B

    The lanthanide contraction

    C

    The d-block contraction

    D

    Relativistic effects

    Question Tags

    📚 Subject:Chemistry
    📑 Chapter:Classification of Elements and Periodicity in Properties
    🎯Topic:Atomic Radius
    🎓 Ncert Level:Application
    🎯Difficulty :Hard
    ⚡ Time Required :1.5 mins
    🔄Ncert Concepts :Atomic Radius, d-block Contraction, Shielding Effect
    5.

    Considering the isoelectronic series S2-, Cl-, Ar, K+, Ca2+, and the fact that electron-electron repulsion in the outermost shell influences effective nuclear charge and hence atomic radius, which of the following statements is INCORRECT?

    A

    The radius decreases from S2- to Ca2+.

    B

    Ca2+ has the smallest radius in the series.

    C

    Electron-electron repulsion is the dominant factor influencing the radius in this series, causing the radius to increase from S2- to Ca2+.

    D

    All species have the same number of electrons but different numbers of protons.

    Question Tags

    📚 Subject:Chemistry
    📑 Chapter:Classification of Elements and Periodicity in Properties
    🎯Topic:Atomic Radius
    🎓 Ncert Level:Analyzing
    🎯Difficulty :Hard
    ⚡ Time Required :2.5 mins
    🔄Ncert Concepts :Atomic Radius, Effective Nuclear Charge, Isoelectronic Series
    6.

    Which of the following correctly explains the observed trend in atomic radii down Group 13 (Boron Family) considering the influence of d- and f-block electron filling in subsequent periods?

    A

    Atomic radii consistently increase from B to Tl due to the increasing number of electron shells.

    B

    Ga has a significantly smaller radius than Al due to the lanthanide contraction.

    C

    Tl has a larger radius than In, but the increase is smaller than expected due to the d-block contraction.

    D

    While the general trend is an increase in radius down the group, Ga experiences a smaller than expected increase in radius compared to Al due to the poor shielding effect of the 3d electrons, while Tl exhibits a smaller than expected increase compared to In due to the poor shielding of both the 4f and 5d electrons.

    Question Tags

    📚 Subject:Chemistry
    📑 Chapter:Classification of Elements and Periodicity in Properties
    🎯Topic:Atomic Radius
    🎓 Ncert Level:Analyzing
    🎯Difficulty :Hard
    ⚡ Time Required :2.5 mins
    🔄Ncert Concepts :Atomic Radius, d-block Contraction, f-block Contraction, Shielding Effect
    7.

    Which of the following correctly explains the trend in atomic radius across period 2 of the periodic table?

    A

    Decreases due to increasing effective nuclear charge

    B

    Increases due to increasing number of electrons

    C

    Remains constant as the number of shells remains the same

    D

    Increases due to decreasing effective nuclear charge

    Question Tags

    📚 Subject:Chemistry
    📑 Chapter:Classification of Elements and Periodicity in Properties
    🎯Topic:Atomic Radius
    🎓 Ncert Level:Understanding
    🎯Difficulty :Medium
    ⚡ Time Required :1 mins
    🔄Ncert Concepts :Atomic Radius, Periodic Trends, Effective Nuclear Charge
    8.

    Which element has the largest atomic radius?

    A

    Sodium (Na)

    B

    Potassium (K)

    C

    Magnesium (Mg)

    D

    Calcium (Ca)

    Question Tags

    📚 Subject:Chemistry
    📑 Chapter:Classification of Elements and Periodicity in Properties
    🎯Topic:Atomic Radius
    🎓 Ncert Level:Application
    🎯Difficulty :Medium
    ⚡ Time Required :1 mins
    🔄Ncert Concepts :Atomic Radius, Periodic Trends
    9.

    Why is the atomic radius of chlorine smaller than that of sulfur?

    A

    Chlorine has fewer electrons than sulfur

    B

    Chlorine has a higher effective nuclear charge than sulfur

    C

    Sulfur has more protons than chlorine

    D

    Sulfur has a filled 3p subshell

    Question Tags

    📚 Subject:Chemistry
    📑 Chapter:Classification of Elements and Periodicity in Properties
    🎯Topic:Atomic Radius
    🎓 Ncert Level:Understanding
    🎯Difficulty :Medium
    ⚡ Time Required :1 mins
    🔄Ncert Concepts :Atomic Radius, Effective Nuclear Charge, Periodicity
    10.

    Which factor contributes MOST to the decrease in atomic radius across a period from left to right?

    A

    Increasing number of neutrons

    B

    Increasing shielding effect of inner electrons

    C

    Increasing nuclear charge

    D

    Decreasing number of valence electrons

    Question Tags

    📚 Subject:Chemistry
    📑 Chapter:Classification of Elements and Periodicity in Properties
    🎯Topic:Atomic Radius
    🎓 Ncert Level:Understanding
    🎯Difficulty :Medium
    ⚡ Time Required :1 mins
    🔄Ncert Concepts :Atomic radius, Effective nuclear charge, Periodic trends

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