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Ionization energy Original Scenario-Based Practice

Chemistry · The Periodic Table · Chemistry · Periodic Trends

1 Chemistry practice questions on Ionization energy. Questions built around original scenarios.

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Questions

  1. 1.

    During an atmospheric survey of an uncharted exoplanet, a deep-space probe analyzes three consecutive Period 3 elements, designated Alpha, Beta, and Gamma in order of increasing atomic number. Sensor telemetry reveals that even though atomic number increases steadily, element Beta requires noticeably less energy to remove its outermost electron than element Alpha does. Which statement correctly identifies elements Alpha and Beta and explains this observed anomaly in first ionization energy?

    • A) Alpha is magnesium and Beta is aluminum; aluminum's outermost electron occupies a higher-energy 3p subshell that is shielded by the 3s subshell, requiring less energy to remove.
    • B) Alpha is aluminum and Beta is silicon; silicon's increased nuclear charge pulls the electron cloud tighter, reducing the energy needed to strip its valence electron.
    • C) Alpha is phosphorus and Beta is sulfur; sulfur has a completely filled p subshell that repels valence electrons outward into free space.
    • D) Alpha is sodium and Beta is magnesium; magnesium has a larger atomic radius than sodium, which significantly weakens its effective nuclear charge.

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