Across
- 2. contains protons and neutrons
- 4. horizontal rown in a periodic table
- 5. a substance formed as the result of a chemical reaction
- 7. where electrons are when they go around the nucleus of an atom
- 10. the substances that create a product
- 11. good conductor of heat and electricity
- 13. semi-conductors
- 15. the principle that matter cannot be created or destroyed
- 17. a table of the chemical elements arranged in order of atomic number
- 19. total number of protons and neutrons in a nucleus
Down
- 1. a number that goes before the chemical formula
- 3. negative charge particle in an atom
- 6. bad conductors
- 8. tells us the number of atoms of each element in a compound
- 9. outer shell electron that is assoiciated with an atom
- 12. nuetral charged particle in an atom
- 14. the number of protons in the nucleus of an atom, which determines the chemical properties of an element and its place in the periodic table.
- 16. vertical columns in a periodic bubble
- 17. positive charged particle in an atom
- 18. a basic unit of a chemical element