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