chemical patterns 0.0 / 5 ? ChemistryAtomsChemical patterns and reactivity seriesGCSEOCR Created by: beth_heyyCreated on: 26-04-16 19:59 68943152710 Across 1. when a more reactive halogen takes place of a less reactive halogen (12, 8) 7. negative ions ___ an electron (4) 8. electrons in different shells have different ___ (6, 6) 9. The elements in group 7 (8) 10. Na (6) Down 2. the second shell of an atom can hold up to ___ elctrons (5) 3. the halogens all contain ___ molecules (8) 4. atoms with up to 3 electrons in their outer shell are ___ (6) 5. The part of an atom with a +1 charge (6) 6. Group 1 are (6, 6)
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