Periodic Table Trends

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Across
  1. 2. the elements in Group 18 or 8A of the periodic table; have 8 valence electrons
  2. 3. the 15 elements with atomic numbers from 89 to 103; all are radioactive
  3. 10. The amount of energy required to remove an electron from an atom
  4. 11. Elements that are poor conductors of heat and electric current
  5. 14. the net positive charge experienced by an electron in a many-electron atom; this charge is not the full nuclear charge because there is some shielding of the nucleus by the other electrons in the atom
  6. 16. metallic elements in group 2 of the periodic table which are harder than the alkali metals and are also less reactive; have two valence electrons
  7. 18. Groups 3-12, 1-2 electrons in the outer energy level, less reactive than alsali-earth metals, shiny, good conductor of thermal energy and electrical current, high density
  8. 19. The ease and speed with which an element combines, or reacts, with other elements and compounds.
Down
  1. 1. a diagram to represent electrons in the outer energy level of an atom; uses the element symbol and dots
  2. 4. electric force between charged objects depends on the distance between the objects and the magnitude of the charges.
  3. 5. Distance from the center of an ion's nucleus to its outermost electron
  4. 6. A repulsive force caused by the similar negative charge of two or more electrons.
  5. 7. Group 17 or 7A; elements have 7 valence electrons
  6. 8. The electrons in the outermost shell (main energy level) of an atom; these are the electrons involved in forming bonds.
  7. 9. Group 1, 1 electron in outer level, very reactive, soft, silver, shiny, low density; Lithium, Sodium, Potassium, Rubidium, Cesium, Francium
  8. 12. elements with properties that fall between those of metals and nonmetals
  9. 13. Most elements are metals; they are typically solid, shiny, malleable, and good conductors of heat and electricity.
  10. 14. A measure of the ability of an atom in a chemical compound to attract electrons
  11. 15. any of the series of fifteen metallic elements from lanthanum to lutetium in the periodic table.
  12. 17. one-half the distance between the nuclei of two atoms of the same element when the atoms are joined