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Please help with #’s 12 ,20,21

Please help with #’s 12 ,20,21
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Please help with #’s 12 ,20,21

Please help with #’s 12 ,20,21-example-1
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User Chris Rymer
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the atomic number
12= Magnesium (Mg)
20= Calcium (Ca)
21= Scandium (Sc)
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User MastaH
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