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    myred91mr2's Avatar
    myred91mr2 Posts: 1, Reputation: 1
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    #1

    Oct 6, 2008, 06:46 PM
    Electrons and ionic charges
    How do I determine the number of electrons in an ion with 20 protons and an ionic charge of 2- ?
    Unknown008's Avatar
    Unknown008 Posts: 8,076, Reputation: 723
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    #2

    Oct 8, 2008, 01:27 AM

    Remember: Number of protons in an atom = number of eectrons in that atom.

    Therefore, in such an atom, there must be 20 electrons. Since this ion has a charge of -2, this means that there are 2 more lectrons in the ion or 2 less protons. But since the number of protons cannot change, there are 2 more electrons. Can you do it now?

    If the charge was +2, then, there would have been 2 less electrons.

    Rate my answer if you don't mind:)
    Jonathan Thropa's Avatar
    Jonathan Thropa Posts: 1, Reputation: 1
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    #3

    Oct 28, 2008, 08:00 PM
    What Are the 2 ideal electron arrangements
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