Across
- 2. Mass Combine Protons and Neutrons to get
- 4. The elements in Groups 3 through 12
- 5. electron Determines chimical reactivity
- 9. the identifier of an element
- 10. Energy levels detemine an elements placement
- 11. The first 3 elements in group 16 are
Down
- 1. Number Is the number of protons in an element
- 3. the 2nd and 3rd element in group 14 is a
- 6. In a neutral atom it is the same amount as protons
- 7. Determined by the number of valance electrons in an element
- 8. element with 5 protons and 3 valance electrons