Periodic table - magnesium 0.0 / 5 ? ScienceMagnesiumNational 5None Created by: NicstarCreated on: 30-01-14 05:50 5214 Across 1. How many electron shells does magnesium have? (5) 4. How many electrons does the first one have? (3) Down 1. How many electrons does the third shell have? (3) 2. Magnesium is a (metal or nonmetal) (5) 5. How many electrons does the second shell have? (5)
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