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What is the value of electron gain enthalpy of if of ?
(a)
(b)
(c)
(d)

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Important Questions on Classification of Elements and Periodicity in Properties
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Identify the wrong statement in the following:

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The Ionisation enthalpy of and are , respectively then what will be the ionisation enthalpy of in :

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Be2+ is isoelectronic with which of the following ions?

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Correct order of atomic radius is:-

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Incorrect order of acidic strength is:-

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The species and contain the same number of electrons. In which order do their radii increase?

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Because of lanthanoid contraction, which of the following pairs of elements have nearly the same atomic radii? (Numbers in the brackets are atomic numbers).

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The formation of the oxide ion , from oxygen atom requires first an exothermic and then an endothermic step as shown below:
Thus process of formation of in gas phase is unfavourable even though is isoelectronic with neon. It is due to the fact that
