Periodic table

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Across
  1. 3. arranged in increasing order of their atomic weight "triads"
  2. 5. chemical property that describes an atoms ability to attract electron
  3. 6. The properties that reappear at regular intervals, or in which there is gradual variation (increase or decrease) at regular interval are periodic properties
Down
  1. 1. shell of an isolated gaseous atom
  2. 2. Potential The amount of energy required to remove a loosely bound electron from the
  3. 4. arranged the element in increasing order of their atomic weights "every eighth element was a repetition of the first"