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