PERIODIC TABLE

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Across
  1. 2. Material that allows electricity to flow easily
  2. 4. The total number of protons and neutrons
  3. 6. Electrons in the outermost shell of an atom
  4. 10. Elements in the same group have the same _______
  5. 13. Vertical columns in the periodic tableReactivity How easily an element reacts with others
  6. 14. Particles with no charge found in the nucleus
  7. 15. The smallest unit of an element
  8. 16. A state of matter common for many nonmetals
  9. 17. Elements that do not conduct electricity well and are often gases
  10. 19. Horizontal rows in the periodic table
  11. 20. A common property of metals
Down
  1. 1. Number of protons in an atom
  2. 3. Ability to conduct heat and electricity
  3. 5. A state of matter common for most metals
  4. 7. Negatively charged particles that move around the nucleus
  5. 8. Elements that are stable and nonreactive on the right side
  6. 9. A pure substance made of only one type of atom
  7. 11. Positively charged particles in the nucleus
  8. 12. Tool that organizes all elements by atomic number
  9. 18. Elements with properties of both metals and nonmetals