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Identify an element or its group from successive ionisation energies

This type of question, asked 2 times: 2021 Paper 6, 24 Jan 2025. All 2 questions below, oldest first.

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  1. Question 1

    2021 Paper 6

    34
    Identify the elements XX and YY using the ionisation energy values (kJ/mol) given below:
    Element1st IE2nd IE
    X4954563
    Y7311450

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  2. Question 2

    24 Jan 2025

    120
    The successive 5 ionisation energies of an element are 800,2427,3658,25024800,2427,3658,25024 and 32824 kJ/mol32824\text{ }kJ/mol, respectively. By using the above values predict the group in which the above element is present :

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