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Lanthanoid with the highest first ionisation enthalpy (ytterbium)

The same question, asked 2 times: 22 Apr 2025 S2, 25 Apr 2025 S1. Every wording below, oldest first.

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  1. Question 1

    22 Apr 2025 S2

    61
    Identify the element having highest ionisation enthalpy (IE1IE_{1}) from following.

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  2. Question 2

    25 Apr 2025 S1

    73
    Which lanthanoid from following has highest ionisation ( IE1IE_{1} ) enthalpy?

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