Across
- 3. particles with an electronic charge
- 4. when an atom loses electrons
- 5. material such as copper wire through which electrons move easier
- 7. electrically neutral particles inside the nucleus of an atom
- 8. elements in groups of 3 to 12 of the periodic table
- 11. they combine really good with other elements
- 14. center of an atom
- 15. the particles move fast
- 17. fluorine, and chlorine, are called halogens
- 19. the number of protons in an atom
- 20. verticle row in the periodic table
- 21. atom of an element that has a specific number of neutrons
- 23. organized list of all known elements arranged by atomic number
Down
- 1. they are good conductors
- 2. the chemical symbol surrounded by dots
- 6. an element is matter that is composed by only one type of atom
- 9. element that is normally a gas or a solid at room temp
- 10. elements in the same group have the same number of electrons in their outer most energy levels
- 11. the number of protons and neutrons
- 12. a charged particle that has either more or fewer electrons than protons
- 13. a charged particle that has more or fewer electrons than protons
- 16. a good conductor of heat and electricity
- 18. particle in the nucleus with a electric charge of +1
- 22. horizontal row in the periodic table