IPC Crossword p.569

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Across
  1. 3. / Neutral particle, composed of quarks, inside the nucleus of an atom.
  2. 4. / Horizontal row in the periodic table
  3. 7. / Uses the symbol for an element and dots representing the number of electrons in the element's outer energy level.
  4. 9. / Sum of the number of protons and neutrons in an atom's nucleus.
  5. 10. / Negatively charged particles surrounding the center of an atom.
  6. 11. / Vertical column in the periodic table.
  7. 12. / Number of protons in an atom's nucleus
  8. 15. / Atoms of the same element that have different numbers of neutrons.
Down
  1. 1. / Area around the nucleus of an atom where the atom's electrons are most likely to be located.
  2. 2. / Particles of matter that make up protons and neutrons.
  3. 5. / Organized list of all known elements that are arranged according to repeated changes in properties
  4. 6. / The smallest piece of matter that still retains the property of the element.
  5. 8. / Weighted-average mass of the mixtures of an element's isotopes
  6. 13. / Positively charged center of an atom that contains protons and neutrons and is surrounded by a cloud of electrons.
  7. 14. / Positively charged particle, composed of quarks, inside the nucleus of an atom.