Across
- 4. occurs when the nucleus loses or gains a nuetron
- 6. number of protons contained in an atom
- 8. Two or more substances combine to produce a single new substance.
- 9. bunch of atoms bonded together
- 13. occurs when an acid is added to a base
- 15. when electrons flow from atom to atom
- 16. exist in shells or energy levels around the nucleus
- 17. made from atoms
- 18. when a single compound breaks down into two or more simpler products.
Down
- 1. arranges elements based on atomic number and their properties
- 2. exothermic chemical reaction, requires fuel and oxygen
- 3. measure of the ability of an atom or molecule to attratct a pair of electrons in a covalent bond
- 5. scale acids and bases are measured with this
- 7. contains two or more atoms
- 10. elements and/or compounds rearrange themselves in the equation
- 11. opposite of an acid
- 12. chemicals that will change colours when added to an acid or base
- 14. liquid that releases positively charged hydrogen ions