The formation of the oxide ion, O 2 - g , from oxygen atom requires first an exothermic and then an endothermic step as shown below: O g + e - → O - g ; ∆ H ⊖ = - 141 kJ mol - 1 O - g + e - → O 2 - g ; ∆ H ⊖ = + 780 kJ mol - 1 Thus process of formation of O 2 - in gas phase is unfavourable even though O 2 - is isoelectronic with neon. It is due to the fact that,

Electron repulsion outweighs the stability gained by achieving noble gas configuration

Addition of electron in oxygen results in larger size of the ion.

O - ion has comparatively smaller size than oxygen atom

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Write the number of pairs in which size of first element or ion is higher as compared to ${II}^{nd}$ out of following eight pairs.
$(O, S), (He, Ne), (Kr, Ne), (Na, {Na}^{+}), (Cl, {Cl}^{-}), (I^{-}, {Cl}^{-}), (Li, Na), ({Li}^{+}, {Na}^{+})$

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Important Questions on Classification of Elements and Periodicity in Properties

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Beta Question Bank for Engineering: Chemistry>Chapter 13 - Classification of Elements and Periodicity in Properties>EXERCISE-3>Q 31

Total number of enthalpy(s) (out of given eight) of

A (g)

which is/are not associated with conversion of

A_{(g)}^{-} \to A_{(g)}^{+ 4}

${IE}_{1}, {IE}_{2}, {IE}_{3}, {IE}_{4}, {IE}_{5}, {IE}_{6}, {EGE}_{1}, {EGE}_{2}$

( $IE =$ ionization energy, $EGE =$ electron gain enthalpy)

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Beta Question Bank for Engineering: Chemistry>Chapter 13 - Classification of Elements and Periodicity in Properties>EXERCISE-3>Q 32

Calculate

E . N

. of chlorine atom on Pauling scale if

I . E

. of

{Cl}^{-}

4 eV

E . A

. of

{Cl}^{+}

+ 13.0 eV

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Beta Question Bank for Engineering: Chemistry>Chapter 13 - Classification of Elements and Periodicity in Properties>EXERCISE-3>Q 33

Upto argon find the number of elements which have lower

{IE}_{1}

as compared to

He

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Beta Question Bank for Engineering: Chemistry>Chapter 13 - Classification of Elements and Periodicity in Properties>EXERCISE-4>Q 2

The order of screening effect of electrons of

s, p

d,

and

f

orbitals of a given shell of an atom on its outer shell electrons is:

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Beta Question Bank for Engineering: Chemistry>Chapter 13 - Classification of Elements and Periodicity in Properties>EXERCISE-4>Q 3

The statement that is not correct for periodic classification of elements is:

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Beta Question Bank for Engineering: Chemistry>Chapter 13 - Classification of Elements and Periodicity in Properties>EXERCISE-4>Q 4

Among halogens, the correct order of amount energy released in electron gain (electron gain enthalpy) is

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Beta Question Bank for Engineering: Chemistry>Chapter 13 - Classification of Elements and Periodicity in Properties>EXERCISE-4>Q 6

Which of the following is the correct order of size of the given species :

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Beta Question Bank for Engineering: Chemistry>Chapter 13 - Classification of Elements and Periodicity in Properties>EXERCISE-4>Q 7

The formation of the oxide ion,

O^{2 -} (g),

from oxygen atom requires first an exothermic and then an endothermic step as shown below:

O (g) + e^{-} \to O^{-} (g); ∆ H^{⊖} = - 141 kJ {mol}^{- 1}

O^{-} (g) + e^{-} \to O^{2 -} (g); ∆ H^{⊖} = + 780 kJ {mol}^{- 1}

Thus process of formation of

O^{2 -}

in gas phase is unfavourable even though

O^{2 -}

is isoelectronic with neon. It is due to the fact that,

Write the number of pairs in which size of first element or ion is higher as compared to IInd out of following eight pairs. O, S, He, Ne, Kr, Ne, Na, Na+, Cl, Cl-, I-, Cl-, Li, Na, Li+, Na+

Important Questions on Classification of Elements and Periodicity in Properties

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Write the number of pairs in which size of first element or ion is higher as compared to ${II}^{nd}$ out of following eight pairs.
$(O, S), (He, Ne), (Kr, Ne), (Na, {Na}^{+}), (Cl, {Cl}^{-}), (I^{-}, {Cl}^{-}), (Li, Na), ({Li}^{+}, {Na}^{+})$