Atoms and Periodic Table

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123456789101112131415
Across
  1. 2. smallest piece of matter that still has element properties
  2. 4. composed mainly of protons + neutrons in the nucleus; also called the mass number
  3. 7. where elements are organized by increasing atomic number
  4. 9. vertical columns of elements with similar properties
  5. 10. matter that is composed of one type of atom
  6. 11. elements that are usually gases or brittle solids at room temperature
  7. 12. negative charge
  8. 14. good conductor of heat + electricity
  9. 15. smaller particles that make up protons + neutrons
Down
  1. 1. positive charge
  2. 3. elements that make up the stair step & have metallic and non-metallic properties
  3. 5. atoms of the same element that have a different number of neutrons
  4. 6. horizontal rows of elements containing increasing numbers of protons + electrons
  5. 8. the number of protons in an atom
  6. 13. located in the center of the atom; consists of protons and neutrons with electrons surrounding it