Periodic Table Review

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Across
  1. 1. a material that allows electricity (flow of electrons) to move through it easily
  2. 3. a material that has electrical conductivity between that of a conductor and an insulator; conductivity can be controlled
  3. 5. the energy required to remove an electron from a gaseous atom or ion
  4. 8. elements in Group 1 of the periodic table that are highly reactive, have one valence electron, and form +1 ions
  5. 9. elements in Group 2 of the periodic table that are reactive, have two valence electrons, and form +2 ions
  6. 13. half the distance between the nuclei of two identical bonded atoms; a measure of atom size
  7. 14. elements in Group 18 that are very unreactive due to having full valence electron shells
  8. 15. an atom or molecule that has gained or lost one or more electrons and carries a charge
  9. 16. atoms tend to gain, lose, or share electrons to achieve a full valence shell of eight electrons
  10. 17. arrangement of electrons in an atom’s orbitals (energy levels and sublevels)
Down
  1. 1. characteristics of a substance that describe its ability to undergo chemical changes and form new substances
  2. 2. a negatively charged ion formed when an atom gains electrons
  3. 4. elements with properties intermediate between metals and nonmetals; often semiconductors
  4. 6. elements in Group 17 that are highly reactive nonmetals with seven valence electrons and form −1 ions
  5. 7. the ability of an atom to attract electrons in a chemical bond
  6. 10. describes how readily a substance undergoes chemical change or reacts with other substances
  7. 11. a positively charged ion formed when an atom loses electrons
  8. 12. electrons in the outermost energy level of an atom that are involved in bonding