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NEET UG CHEMISTRY MCQ: CLASSIFICATION OF ELEMENTS AND PERIODICITY IN PROPERTIES

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Which one of the following has the lowest ionisation energy?

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Correct option: B

1{s^2}2{s^2}2{p^6}3{s^1}

Option B (

1{s^2}2{s^2}2{p^6}3{s^1}

) is correct because it represents an element with only one valence electron in the 3s orbital, which is easily removed, resulting in low ionization energy.

More Questions from CLASSIFICATION OF ELEMENTS AND PERIODICITY IN PROPERTIES

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The elements with zero electron affinity are S-I:

\mathrm{Cu}^{+2}

paramagnetic.

S-II: All the orbitals present in

\mathrm{Cu}^{+2}

ion are doubly occupied. Which of the following is the most electropositive element? The law of Octaves is not applicable to: Assertion (A): Mendeleev's arranged elements in horizontal rows and vertical columns.
Reason (R): Mendeleev's ignored the order of atomic weight thinking that the atomic measurements might be incorrect. Which of the following electronic configuration does not belong to same block as others?