Periodic Table Vocabulary

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Across
  1. 4. vertical column in the periodic table
  2. 5. elements with properties that fall between those of metals and nonmetals; semimetals
  3. 7. most reactive metals; contain 1 valence electrons; soft, silver, shiny, low density
  4. 9. Radius the size of the atom; one-half the distance between the nuclei of identical atoms that are bonded together
  5. 10. most reactive nonmetals that contain 7 valence electrons
  6. 14. the ability of an atom to attract electrons when the atom is in a compound
  7. 15. a molecule consisting of two atoms of the same element
Down
  1. 1. less reactive than alkali-earth metals shiny, good conductors of thermal energy and electrical current, high density; located in groups 3-12
  2. 2. least reactive elements due to a full outermost energy level; most contain 8 valence electrons
  3. 3. the energy change that occurs when a neutral atom attracts an electron to become a negative ion
  4. 6. the energy required to remove an electron from a neutral atom
  5. 8. metallic elements in group 2 that are less reactive and harder than the alkali metals
  6. 11. poor conductors of heat and electric current
  7. 12. horizontal row in the periodic table
  8. 13. good conductors of heat and electric current