Across
- 1. Horizontal row of elements on the Periodic Table that have the same number of electrons.
- 5. States that matter is neither created nor destroyed in ordinary chemical and physical changes.
- 6. An interaction that holds atoms together.
- 8. A chemical reaction in which heat is released and usually feels warm when the heat is released from the reaction.
Down
- 2. A chemical reaction that requires an input of energy and usually feels cold when it absorbs heat in the reaction.
- 3. Elements that have some properties of metals and non-metals and are found along the zigzag on the Periodic Table.
- 4. electrons on the outermost ring in the shell and determines the reactivity of an atom.
- 7. A vertical column on the Periodic Table that have similar properties.