Please help with #’s 12 ,20,21

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asked May 8, 2019 103k views

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Please help with #’s 12 ,20,21

Chemistry
middle-school

Chris Rymer asked

by Chris Rymer

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the atomic number
12= Magnesium (Mg)
20= Calcium (Ca)
21= Scandium (Sc)

MastaH answered May 13, 2019

by MastaH

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