Across
- 2. a positively charged element
- 3. A gas lighter than air that is used to fill up party balloons
- 5. An Israeli Noble Prize woman
- 7. type of bond where elements share electrons
- 8. The positive particle in the nucleus of an atom
- 11. The compound that H2O stands for
- 13. precious metal
- 14. a particle that consists of more than one atom
Down
- 1. The arrangement of all the elements in the universe
- 4. The formula of table salt
- 6. consists of 80% of the air we breath
- 7. The metal the Statue of liberty is made of
- 9. a group of elements that have a full energy level
- 10. carbon in a beautiful form
- 12. a negative particle in the atom