Across
- 2. these hold atoms together by sharing or donating electrons
- 4. tells us the number of protons and the number of electrons in an atom
- 5. this number is found in front of a chemical formula and tells us the number of molecules of that compound
- 8. anything that has mass and takes up space
- 10. Steam turning to Water turning to ice is the type of change because it is still H2O
- 12. negatively charged particles found outside the nucleus of an atom
- 13. This number found in front and below an element tells us the number of atoms of that element H2O
- 15. positively charged particles in the nucleus of an atom
- 17. Phase changes occur hen this is added or removed
- 18. two or more elements chemically combined
Down
- 1. Type of change like burning which always forms a new substance
- 3. compared to the properties of a compound, the properties of the elements that make them are
- 4. tells us the number of protons plus the number of neutrons
- 6. most of the elements on the periodic table are these hard durable substances
- 7. Pure substance that is the ingredients to everything everywhere
- 8. the smallest amount of a compound you can have is one
- 9. the study of matter and properties of substances
- 11. the smallest amount of matter you can have
- 14. this element makes up most organic molecules because of its ability to bond to so many atoms
- 16. neutral particles found in the nucleus of an atom