Chapter 1 Vocabulary Pt. 1

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Across
  1. 4. — The total number of protons and neutrons in an atom.
  2. 5. — A substance made of two or more different elements chemically bonded together.
  3. 6. — Atoms of the same element that have different numbers of neutrons.
  4. 8. — A material that conducts electricity better than an insulator but not as well as a conductor.
  5. 10. — The small, dense center of an atom that contains protons and neutrons.
  6. 12. — A chart that organizes all known chemical elements by their properties and atomic number.
  7. 14. — A one- or two-letter abbreviation used to represent an element.
  8. 16. — A horizontal row on the periodic table.
  9. 18. — The smallest unit of an element that retains the properties of that element.
  10. 19. — How easily a substance reacts with other substances.
Down
  1. 1. — An electron in the outermost energy level of an atom.
  2. 2. — The number of protons in the nucleus of an atom.
  3. 3. — The average mass of the atoms of an element.
  4. 7. — Able to be hammered or shaped into different forms without breaking.
  5. 9. — A vertical column on the periodic table.
  6. 11. — A negatively charged particle found outside the nucleus of an atom.
  7. 13. — A particle in the nucleus that has no electrical charge.
  8. 15. — The way a substance reflects light; often describes the shininess of metals.
  9. 16. — A positively charged particle found in the nucleus.
  10. 17. — Able to be stretched or drawn into a wire without breaking.