Which atom has an ionic radius that is larger than its atomic radius? (a)Na, b)K, c)Mg, d)Ca, e)Cl) explain.?

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  • 1 decade ago
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    Cl, because when elements lose an electron, there are more protons than electrons. with that more pull in the center, the atom becomes smaller. That is true for Na, Mg, K, Ca, and any other element that loses electrons to ionize. But Cl gains an electron when ionizes. When that happens, there are more electrons than protons. because of this larger pull on the outside of the neucleus, the atom becomes bigger. This is true for all atoms that gain an electron when ionizing.

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  • 1 decade ago

    It would be Cl because cl is highly electronegative so it would gain an electron and as a result it's ionic radius increases whereas the other elements have lower electronegativities and generally give up electrons

    Also the trend on the periodic table is that elements toward the lower left have smaller ionic sizes as opposed to elements toward the top right which become larger

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  • 1 decade ago

    If an atom GAINS electrons to become an ion, its radius will increase, due to electronic repulsion and shielding. Therefore the only correct answer is Cl, because all the others will LOSE electrons and get smaller in size. Cl gains electrons and gets larger in size when it becomes an ion.

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  • ?
    Lv 5
    1 decade ago

    e) Cl

    because the rest are metals, and when they become ions they lose electrons and become positively charged. But when Chlorine becomes an ion it gains an elctron so it has a larger radius than as a neutral atom

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