Is the periodic table accurate???

Question: Is the periodic table accurate???
- Keywords:
  accuracy,
  chemistry,
  element,
  periodic table
Asked by krazykitty25 to Bob, Katie, Nisha, Sallie, Vee on 4 Jul 2012.
- Sallie Baxendale answered on 4 Jul 2012:
  
  yes – very. Its so accurate that scientists predicted what some elements would like even before they were discovered. that doesn’t mean its complete though.
- Bob Bonwick answered on 4 Jul 2012:
  
  Very, but not complete, some of the elements only exist for a few moments as they are created by man and are unstable at best.

Question: Is the periodic table accurate???