Atomic Structure Crossword

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Across
  1. 2. state in which all electrons are at their lowest possible energy level
  2. 5. equal to the number of protons in a neutral atom
  3. 8. horizontal rows on the periodic table
  4. 10. state in which electrons have absorbed energy and "jumped" to a higher energy level
  5. 12. the smallest particle of an element that can enter into chemical change
  6. 13. the number of protons in the nucleus of an atom
  7. 15. atoms with the same atomic number but different atomic masses
Down
  1. 1. most of the mass of an atom is here
  2. 2. vertical columns on the periodic table
  3. 3. cannot be decomposed into simpler substances by ordinary chemical means
  4. 4. sum of the protons and neutron in the nucleus of an atom
  5. 6. the positively charged particle found in the nucleus
  6. 7. mass number minus atomic number
  7. 9. the spontaneous process where an unstable atomic nucleus emits radiation and transforms into a more stable nucleus is called ____________ decay.
  8. 11. the volume of an atom is determined by the size of its electron _______________.
  9. 14. charged atom or group of atoms