Rank the following elements by increasing first ionization Energy: O, Ge, Sc, B…

Rank the following elements by increasing first ionization Energy:

O, Ge, Sc, Ba


"The Periodic Table", image retrieved from Chemistry 2e (https://d3bxy9euw4e147.cloudfront.net/oscms-prodcms/media/documents/Chemistry2e-OP_QCzV58S.pdf) by Flowers, P et al., is licensed under CC BY.
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