Unit 2 Vocabulary

3. A subatomic particle which orbits the nucleus, with almost no mass and a negative charge
5. A chemical reaction in which one reactant becomes multiple products
6. A subatomic particle located in the nucleus, with a mass of 1 AMU and a positive charge
8. A substance that cannot be broken down into simpler substances by any physical or chemical means
9. The central part of an atom, containing protons and neutrons
12. A material that decreases the rate of a chemical reaction
13. A chemical reaction in which multiple reactants become a single product

1. A chemical bond in which the atoms share pairs of valence electrons
2. The smallest particle of an element
3. A measure of how strongly an atom pulls on electrons
4. A substance made of several elements joined by chemical bonds in a specific ratio
7. A material that increases the rate of a chemical reaction by lowering the activation energy
9. A subatomic particle located in the nucleus, with a mass of 1 AMU and no charge (neutral)
10. The electrons farthest from the nucleus, which are responsible for chemical reactions
11. An atom which has lost or gained electrons, thereby becoming positively or negatively charged