The First 20 Elements The first 20 elements 0.0 / 5 ? ChemistryAtomic structureOtherNone Created by: sheskely1Created on: 09-11-14 16:50 96327541108 Across 1. This element is in group 3 (9) 7. This element is a noble gas (4) 8. Would need to gain 3 electrons to have a full outer shell (9) Down 2. Atomic number is 11 (6) 3. In swimming pools (8) 4. Has a mass number of 14 (7) 5. Found in milk (7) 6. This element has an elctron configration of 2.1 (7) 9. This element has 5 electrons (5) 10. In group 0 (5)
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