Vocab

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