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19-10-2017
Physics

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Which of these elements do not have atoms whose outer shells are full of electrons?
A) neon
B) argon
C) radium
D) krypton

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19-10-2017

The answer is radium. Recall that all of the elements with full electron shells are on the column to the farthest right on the periodic table. These are known as Noble Gases, and are nonreactive.

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