The Atom and Periodic Table

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Across
  1. 5. The horizontal rows on the periodic table.
  2. 8. Atoms of the same element that have different numbers of neutrons.
  3. 9. Number of periods on the periodic table.(spell number)
  4. 11. Number of groups on the periodic table (spell number)
  5. 13. The vertical (up and down) columns on the periodic table.
  6. 14. The father of the periodic table Dmitri________.
  7. 16. Number of electrons the "first" energy shell can hold. (spell number)
  8. 17. The charge of the nucleus.
  9. 19. The negatively charged subatomic particles in the atom.
Down
  1. 1. The positively charged subatomic particles in the atom.
  2. 2. The top number in the square (# of protons in the nucleus).
  3. 3. Word for regular repeating pattern.
  4. 4. The bottom number in the square (protons + neutrons)
  5. 6. The science chart made up of atoms of elements. (2 words)
  6. 7. The dense central part of the atom.
  7. 10. One of the two main parts of the atom where electrons are found (2 words).
  8. 12. The neutrally charged subatomic particles in the atom.
  9. 15. Only those electrons in the outermost energy shell.
  10. 18. Substance made up of only one type of atom.