Unit 3

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Across
  1. 2. the reduction of the attractive force between a nucleus and its outer electrons due to the blocking effect of the inner electrons
  2. 3. The amount of energy required to remove an electron from an atom
  3. 4. An atom's ability to attract electrons and form negative ions.
  4. 8. Group 1A, 1 valence electron in outer level, very reactive, soft, silver, shiny, low density; Lithium, Sodium, Potassium, Rubidium, Cesium, Francium. Lose 1 electron to form positive ions.
  5. 10. Atom's ability to attract and hold electrons.
  6. 11. Along with the inner transition metals these make up group B of the periodic table. These are placed in the middle of the periodic table.
  7. 12. Group 6A, contain 6 valence electrons. Gain 2 electrons to form negative ions.
  8. 15. A vertical column of elements in the periodic table; elements in a group share chemical properties.
  9. 17. A horizontal row of elements in the periodic table
  10. 18. Group 2A, 2 valence electrons in outer level. Lose 2 electrons to form positive ions.
Down
  1. 1. Resulting positive nuclear charge an outer electron senses after accounting for the shielding effect of inner core electrons. Increases from left to right, and bottom to top on the Periodic Table.
  2. 5. Element that has properties of both metals and no metals. Located along the "stair-step" of the periodic table
  3. 6. Elements that are solid at room temperature; shiny, malleable, ductile; left side of the periodic table; conduct heat and electricity
  4. 7. One half the distance between the nuclei of two atoms of the same element when the atoms are joined
  5. 9. States that when the elements are arranged by increasing atomic number, there is a periodic repetition of their chemical and physical properties
  6. 13. Elements in group 8A of the periodic table. Have no charge and are gases under normal conditions. (Helium, Neon, Argon, Krypton, Xenon, Radon)
  7. 14. Group 7A, Contains nonmetals, 7 valence electrons in it's outermost energy level. Very reactive. Gain 1 electron to form negative ions.
  8. 16. Element that usually is a gas or brittle solid at room temperature, is not a malleable or ductile, is a poor conductor of heat and electricity, and typically is not shiny. Located on right side of periodic table.