Ionisation Enthalpy of p-block Element (Jee Mains)

Periodic Trends in Properties

Medium

Ionisation Enthalpy of p-block Element

A ‘p’-block element (E) and hydrogen form a binary cation (EH_x)⁺, while EH₃ on treatment with K₂HgI₄ in alkaline medium gives a precipitate of basic mercury(II)amido-iodine. Given below are first ionisation enthalpy values (kJ mol^–1) for first element each from group 13, 14, 15 and 16. Identify the correct first ionisation enthalpy value for element E.

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