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What element forms an ion with an electronic configuration of [kr] and a –2 charge?
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What element forms an ion with an electronic configuration of [kr] and a –2 charge?

User Molly
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Must be Selenium (Se). It is two space away from Kr, which means that it needs two extra electron to be like a noble gas, Kr.
User BLC
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Must be Selenium (Se). It is two space away from Kr, which means that it needs two extra electron to be like a noble gas, Kr.
User Brandon Clark
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