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Of four atoms bellow,which two would be in the same group? Sorry that the quality is so bad :(
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Of four atoms bellow,which two would be in the same group? Sorry that the quality is so bad :(

Of four atoms bellow,which two would be in the same group? Sorry that the quality-example-1
User Comatose Turtle
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Numbers 1 and 4 because they have the same number of outer electrons.
User BassMHL
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