Atoms & Periodic Table

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Across
  1. 2. electrons, Electrons in the outermost portion of the electron cloud that form chemical bonds
  2. 3. symbol, Abbreviation for an element's name
  3. 5. Horizontal rows of elements with predictable changes in physical and chemical properties
  4. 7. table, An arrangement of the elements in order of their atomic numbers & increasing atomic mass
  5. 10. Subatomic particles that has a negative charge
  6. 12. Elements that are poor conductors of heat and electricity
  7. 14. A substance made up of atoms of at least two different elements joined by chemical bonds
  8. 16. A substance that is made up of one or more of the same kind of atom
  9. 17. Vertical column of elements in the period table that have similar physical and chemical properties
  10. 18. number, The total number of protons and neutrons in an atom's nucleus
  11. 19. Subatomic particles that has no charge
Down
  1. 1. atomic mass, Weighted average of the masses of all naturally occurring isotopes of an element
  2. 4. number, The number of protons in the nucleus of an atom
  3. 6. cloud, Region of an atom that surrounds the nucleus contains electrons
  4. 7. Subatomic particles that has a positive charge
  5. 8. Elements that have some properties of metals and nonmetals
  6. 9. The smallest unit of an element that maintains the properties of that element
  7. 11. An atom of an element that have a different number of neutrons
  8. 13. Small dense center of the atom that contains protons and neutrons
  9. 15. Elements that are shiny and conduct heat & electricity well