Vocab

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Across
  1. 2. particles with a negative 1 charge
  2. 4. the elements are arranged by increasing atomic number and by changes in physical and chemical properties
  3. 7. area around the nucleus of an atom where its electrons are most likely found
  4. 8. the number of protons in the element
  5. 9. particles with a positive 1 charge
  6. 10. the vertical columns in the periodic table
  7. 12. protons and neutrons are made of even smaller particles called
  8. 14. the sum of the protons and the neutrons in the element
Down
  1. 1. atoms of the same element that have different numbers of neutrons. (different mass numbers)
  2. 3. small positively charged center of the atom. contains the protons and neutrons
  3. 5. uses the symbol of the element and dots to represent the electrons in the outer energy level
  4. 6. the smallest piece of matter that still retains the properties of the element
  5. 11. neutral particles that have 0 charge
  6. 13. the horizontal rows in the periodic table