Chemistry cross word

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Across
  1. 3. subdivision of electron shells separated by electron orbitals
  2. 5. a regular periodic variation of properties of elements with atomic number and position in the Periodic table
  3. 6. The arrangement of electrons in an atom
  4. 8. a grouping of electrons surrounding the nucleus of an atom
Down
  1. 1. the energy required to remove the most loosely held electron from one mole of gaseous atoms to produce 1 mole of gaseous ions with a charge 1+.
  2. 2. used to describe the size of an atom, referring to ions radius, covalent radius, metallic radius, or van der Waals radius.
  3. 4. a horizontal row of elements in the periodic table
  4. 7. describes the decrease in attraction between an electron and the nucleus in any atom with more than one electron shell