Two hypothetical atoms, A and B

CHEMISTRY · Single correct · A Level · Chemistry · Periodicity and periodic trends · Periodicity and periodic trends

Problem

Two hypothetical atoms, A and B, each contain a single valence electron in the same principal energy level. Experimental estimates give the following data: Atom A: effective nuclear charge experienced by the valence electron, Zeff=4.0Z_{\text{eff}} = 4.0; atomic radius =70 pm= 70\,\text{pm} Atom B: effective nuclear charge experienced by the valence electron, Zeff=3.0Z_{\text{eff}} = 3.0; atomic radius =100 pm= 100\,\text{pm} Based on these data, which atom is expected to have the larger first ionization energy? (a) Both atoms should have nearly identical first ionization energies (b) Atom B only (c) Atom A only (d) The available data are insufficient to make a prediction

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