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Periodic law Transitional Reasoning Practice

Chemistry · The Periodic Table · Chemistry · Organization of the Periodic Table

1 Chemistry practice questions on Periodic law. Questions that build towards applied reasoning.

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Questions

  1. 1.

    A student observes that tellurium (atomic number 52) has a standard atomic mass of 127.60 u, whereas iodine (atomic number 53) has a lower standard atomic mass of 126.90 u despite following tellurium in the periodic table. The teacher notes that early chemists struggled to explain this inversion until the modern periodic law was formulated. Based on this observation and the periodic law, which statement correctly explains why iodine is placed after tellurium?

    • A) Iodine has fewer neutrons in its nucleus, which automatically forces it into a subsequent group to preserve mass symmetry across the period.
    • B) Chemical reactivity depends primarily on the total mass of the atom, so iodine was placed after tellurium purely to balance the average density of the halogens.
    • C) The physical and chemical properties of elements recur periodically when arranged in order of increasing atomic number, regardless of atomic mass variations.
    • D) Tellurium exhibits metalloid behavior that requires it to be listed before nonmetals, overriding the standard progression of nuclear charge.

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