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    I am not sure if it is group 4-7 or 5-7. Can someone help me?
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    I think it’s 5-7 because group 4 does not form ions
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    (Original post by cmatthews2001)
    I think it’s 5-7 because group 4 does not form ions
    Thanks. I will note this down.
 
 
 

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