Across
- 1. neutral charge
- 4. table a table that organizes the known elements by order of increasing atomic #
- 6. number # of protons in the nucleus of one atom of an element
- 7. semi-conductors
- 8. little # l indicates the number of atoms of an element
- 10. positively charged
- 11. formula contains coefficient and subscript
- 13. dull,brittle,poor conductors
- 14. mass round to mass #
- 17. mass # -atomic # = # of neutrons
- 19. the smallest unit of an element
- 20. numbers # of energy levels
Down
- 2. negatively charged
- 3. substances we start with in a chemical reaction
- 5. the big #;multiply all subscripts by this
- 9. new substances created in a reaction
- 12. electrons only the electrons in the outer most shell
- 15. shiny,ductile,good conductors
- 16. atomic # = # of protons= # of electrons
- 18. vertical columns