The First 20 Elements The first 20 elements 0.0 / 5 ? ChemistryAtomic structureOtherNone Created by: sheskely1Created on: 09-11-14 16:50 6234871910 Across 1. This elemnt has a mass number of 4 (9) 4. Is produced in limestone production (6) 8. This is used in balloons (6) 9. Has 7 electrons (8) 10. Atomic number is 11 (6) Down 1. This element has 5 electrons (5) 2. Found in milk (7) 3. This is in toothpaste (8) 6. In swimming pools (8) 7. This element is in group 3 (9)
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