Across
- 3. positively charged particle in the nucleus of an atom
- 4. element that has both metallic and non-metallic properties
- 5. vertical column of elements in the periodic table of elements
- 13. group 2 elements in the periodic table
- 16. no additional material is allowed to enter or leave
- 17. abbreviation of atomic mass
- 18. a chemical reaction that absorbs heat energy
- 19. neutral particle in the nucleus of an atom
- 22. most stable and unattractive elements
Down
- 1. when two or more materials react and crate new materials
- 2. the most reactive metal on the table of elements
- 3. when a material changes from one state to another
- 6. the sum of the number of protons and neutrons in an atom
- 7. slow chemical change that occurs when oxygen in the air reacts with a metal
- 8. a chemical reaction that takes place in the cells in your body
- 9. vertical column of elements in the periodic table
- 10. combination of symbols that represent a compound
- 11. group 17 elements in the periodic table
- 12. a chemical reaction that occurs when oxygen reacts with a substance to form a new substance and give off energy
- 13. group one in the periodic table
- 14. dull, brittle element that does not conduct electricity
- 15. a chemical reaction that releases heat energy
- 20. horizontal row of elements in the periodic table
- 21. shiny, malleable, ductile element that conducts electricity
- 23. invisible negatively charged particle that orbits the nucleus of an atom