Across
- 4. number the number of protons in the nucleus of an atom
- 5. a change in matter that produces one or more new substances
- 6. mixture in which different materials can be distinguished easily
- 9. subatomic particle that has a negative charge and is found outside the nucleus
- 11. the smallest particle of an element that retains the properties of that element
- 12. a column on the periodic table
- 13. the electrons in the outermost shell of an atom
- 14. a state of matter with no definite shape or volume
- 15. a substance made up of atoms of two or more different elements joined by chemical bonds
- 17. the number of protons and neutrons in an atom of an element
- 18. a state of matter that has a definite shape and definite volume
- 20. anything that has mass and takes up space
- 21. mass/volume
Down
- 1. elements that are good conductors of heat and electric current
- 2. mixture in which substances are evenly distributed throughout the mixture
- 3. the process by which one or more substances change to produce on or more different substances
- 7. reaction that absorbs energy in the form of heat
- 8. a subatomic particle that has a positive charge and is found inside the nucleus
- 10. the center of an atom which contains the protons and neutrons
- 16. a horizontal row of elements on the periodic table
- 19. atoms of the same element that have different numbers of neutrons