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