Across
- 2. reactions A chemical reaction in which heat is released and usually feels warm when the heat is released from the reaction.
- 6. A chemical reaction that requires an input of energy and usually feels cold when it absorbs heat in the reaction.
- 7. elements that have some properties of metals and non-metals and are found along the zigzag on the Periodic Table.
- 8. electrons on the outermost energy level of an atom that determine the reactivity of the atom.
Down
- 1. states that matter is neither created nor destroyed in ordinary chemical and physical changes.
- 3. horizon row of elements
- 4. veritable line of elements
- 5. an interaction that holds atoms together.