Atoms

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Across
  1. 1. an arrangement of elements by increasing atomic number and by changes in physical and chemical properties
  2. 4. Particle with an electrical charge
  3. 5. Smaller particle that makes up protons and neutrons
  4. 8. A number equal to the number of protons in an atom's Nucleus
  5. 9. Cloud area of an atom where it electrons are most likely found
  6. 10. a horizontal row of elements on the period table
  7. 11. Particle with no charge (neutral)
  8. 12. The symbol of an element with dots
  9. 13. Amount of matter in an object
  10. 15. The Sum of the number of protons and neutrons in an atom
Down
  1. 2. Atoms of the same element with different numbers of neutrons
  2. 3. The average mass of the mixture of isotopes of an element
  3. 6. a vertical column of elements on the periodic table
  4. 7. Smallest piece of matter that has the properties of the element
  5. 11. Small, positively charged center of an atom
  6. 14. Particles with an electrical charge of 1+