Periodic Table Vocabulary

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Across
  1. 3. The smallest particle into which an element can be divided and still be the same substance
  2. 4. The tiny, extremely dense, positively charged region in the center of an atom
  3. 7. The sum of the protons and neutrons in an atom
  4. 8. the process of adding electrons to or removing electrons from an atom or group of atoms
  5. 10. Particles found within the atom, mainly protons, neutrons, and electrons
  6. 13. The properties of elements tend to repeat in a regular pattern when elements are arranged in order of increasing atomic number
  7. 15. A region in an atom where there is a high probability of finding electrons
  8. 16. A one or two letter representation of an element
  9. 17. The number of protons in the nucleus of an atom
  10. 18. Vertical columns on periodic table
  11. 20. The particles of the nucleus that have no charge
Down
  1. 1. The regions inside an atom where electrons are likely to be found
  2. 2. A pure substance that is made up of only one kind of atom
  3. 5. Created the first periodic table, arranged elements by increasing atomic mass
  4. 6. Any of the possible energies an electron may have in an atom
  5. 9. an electron in the outermost energy level of an atom
  6. 11. Atoms that have the same number of protons but have different numbers of neutrons
  7. 12. The horizontal rows of elements in the periodic table
  8. 14. The negatively charged particles found in all atoms
  9. 19. The positively charged particles of the nucleus