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Which of the following electron distributions is invalid?
  • \(2\) in \(n=1\), \(8\) in \(n=2\) and \(4\) in \(n=3\)
  • \(2\) in \(n=1\), \(8\) in \(n=2\), \(18\) in \(n=3\) and \(1\) in \(n=4\)
  • \(2\) in \(n=1\), \(8\) in \(n=2\), \(18\) in \(n=3\) and \(9\) in \(n=4\)
  • \(2\) in \(n=1\)