The Periodic Table

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Across
  1. 2. Electrons in the outermost energy level
  2. 7. always smaller than the parent atom for cations and always larger than the parent atom for anions.
  3. 10. the energy required to remove an electron.
  4. 11. elements, when listed in order of their atomic numbers, fall into recurring groups , so that elements with similar properties occur at regular intervals.
  5. 12. the ability of an atom to attract an electron when the atom is in a compound
  6. 13. Very reactive non-metals (Group 17 or 7A)
  7. 15. ½ the distance between the nuclei of 2 atoms of the same element
  8. 18. an atom with a ‘permanent’ elementary charge
Down
  1. 1. an element with properties in between those of metals and non-metals. These are usually solids at room temp. There are 7 on the periodic table.
  2. 3. Non-reactive non-metals (Group 18 or 8A)
  3. 4. atom with a positive charge
  4. 5. reactive metals (Group 2 or 2A)
  5. 6. Horizontal rows representing the energy level of the outer most (valence) electrons.
  6. 8. an element that lacks metallic attributes, highly volatile (goes into the gas state easily), have low elasticity, and are good insulators of heat and electricity. They are mostly gases. There are 17 on the periodic table.
  7. 9. atom with a negative charge
  8. 14. Vertical rows (columns) representing the number of outer most (valence) electrons.
  9. 16. An element that is typically hard, opaque, shiny, and has good electrical and heat conductivity, malleable (pounded into a thin sheet), fusible and ductile (made into wires). They are mostly solids at room temp.
  10. 17. Very reactive metals (Group 1 or 1A)