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PYQs/Chemistry/Periodic Properties

Chemistry2019easy

Periodic Properties

For the second period elements the correct increasing order of first ionisation enthalpy is:

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Periodic Properties

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

The formation of the oxide ion, $O^{2−}$ (g), from oxygen atom requires first an exothermic and then an endothermic step as shown in below: Thus process of formation of $O^{2−}$ in gas phase is unfavourable though $O^{2−}$ is isoelectronic with neon. It is due to the fact that,

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