Across
- 2. The element ___ makes up 18% of the Human Body.
- 4. A chemical ___ is made of one or two letters that represent an element.
- 5. A chemical ___ illustrates how elements become rearranged in a chemical reaction and can can be used to model chemical changes.
- 6. The Law of Conservation of Matter says that matter cannot be created or ___ in any chemical or physical change.
- 7. Chemical ___ are the forces that hold atoms together to form new substances.
- 9. Protons & neutrons are found in the ___ of an atom.
- 10. A proton is a subatomic particle that has a ___ charge.
- 11. The element ___ makes us most of the Earth's Atmosphere.
- 12. The element ___ makes up about 30% of the Earth's Crust.
- 13. Chemical bonds are formed with ___.
- 16. A(n) ___ is two or more atoms of different elements that are chemically combined.
- 17. ___ number minus atomic number equals number of neutrons.
Down
- 1. A(n) ___ is a subatomic particle that has no charge.
- 3. On a periodic table square, the ___ ___ tells you the number of protons in the atom.
- 4. A(n) ___ is a small number written slightly below and to the right of a chemical symbol that shows how many atoms of an element are in a compound.
- 5. A(n) ___ is a form of matter made up of one type of atom.
- 8. ___ are the basic building blocks of all matter.
- 10. The atoms of one element differ from those of another element in the number of ___.
- 14. An electron is a subatomic particle that has a ___ charge and is located outside the nucleus.
- 15. A chemical ___ is a combination of chemical symbols used to represent a compound.