Among the elements of the second period Li to Ne pick out the element: (i) with the highest first ionisation energy (ii) with the highest electronegativity (iii) with the largest atomic radius Give the reason for your choice.

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TextTrends in Atomic Radius Across Periodic TableTrends in Ionization Enthalpy Across Periodic TableTrends in Electronegativity Across Periodic Table

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The first ionization enthalpy (∆i H ) values of the third period elements, Na, Mg and Si are respectively 496, 737 and 786 kJ mol–1. Predict whether the first ∆i H value for Al will be more close to 575 or 760 kJ mol–1 ? Justify your answer.

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What does atomic radius and ionic radius really mean to you?

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