Across
- 3. - a representation of a chemical reaction in which the reactants and products are expressed as formulas
- 4. - a mixture of two or more elements, at least one of which is a metal, that has the characteristic properties of a metal
- 5. reaction - a chemical reaction in which two compounds exchange positive ions and form new compounds
- 7. - the force that holds atoms or ions together as a unit
- 12. - a chemical bond in which two atoms share a pair of valence electrons
- 13. - notation that shows what elements a compound contains and the ratio of the atoms or ions of these elements in the compound
- 15. - an atom or group of atoms that has a positive or negative charge
- 17. - an ion with a positive charge
- 18. - a substance that undergoes change in a chemical reaction
- 19. - new substances formed as a result of a chemical reaction
- 20. - a chemical reaction in which two or more substances react to form a single substance
Down
- 1. reaction - a chemical reaction in which one element takes the place of another element in a compound
- 2. - an ion with a negative charge
- 6. - the force that holds cations and anions together
- 8. - a neutral group of atoms that are joined together by one or more covalent bonds
- 9. - numbers that appear before a formula in a chemical equation to show the relative proportions of each reactant and product
- 10. - a chemical reaction in which a compound breaks down into two or more simpler substances
- 11. - the energy stored in chemical bonds
- 14. - the attraction between a metal cation and the shared electrons that surround it
- 16. - a diagram of an atom, ion or molecule in which each dot represents a valence electron