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    Sort into Isoelectronic Groups

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    Question:

    Sort these species into isoelectronic groups. It doesn't matter which group goes in which box, so long as the correct species are grouped.

    He, Li+, O^2-, Rb+, Se^2-, F-, Be^2+, Y^3, Mg^2+

    HINT:
    Use a periodic table to determine the atomic number of the atom. For example, xenon's atomic number is 54. A neutral atom has the same number of electrons as protons. Therefore, Xe has 54 electrons.

    Next, determine the number of electrons for each ion. Recall that a positive ion has fewer electrons than protons, and a negative ion has more electrons than protons. For example, iodine (I) has 53 protons and electrons. I- has gained one electron (negative charge), and therefore has 54 electrons.

    Atoms and ions with the same number of electrons are isoelectronic. In this example, I- is isoelectronic with Xe.

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    Answer:

    He, Li+, Be^2+

    O^2-, F-, Mg^2+

    Rb+, ...

    Solution Summary

    This solution helps sort ion species into isoelectronic groups.

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