Chemistry

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Across
  1. 3. A pure substance made of only one kind of atom.
  2. 4. A positively charged ion formed when an atom loses electrons.
  3. 5. A combination of two or more substances that are physically blended, not chemically bonded.
  4. 7. A negatively charged ion formed when an atom gains electrons.
  5. 9. I have 5 protons and 7 electrons. What is my charge?
  6. 10. The average mass of all isotopes of an element, weighted by their abundance.
  7. 12. Electrons in the outermost energy level that determine bonding behavior.
  8. 13. A change that produces one or more new substances with different properties.
  9. 14. The number of protons in an atom; identifies the element on the periodic table.
Down
  1. 1. A reaction in which one element replaces another in a compound.
  2. 2. The ability to reproduce a measurement consistently under the same conditions.
  3. 4. A bond formed when atoms share electrons.
  4. 6. A property that depends on the amount of matter present, such as mass or volume.
  5. 8. Identify the type of reaction: 2 NaI + Pb(NO3)2 → 2 NaNO3 + PbI2.
  6. 11. The smallest unit of an element that retains its chemical properties.