pattern matching - Splitting strings at lower case characters and numbers

I'm trying to split the strings of chemicals into their elements and numbers.

See this example

"Fe3O4" will be split into {"Fe","3","O","4"}

I've tried using StringSplit and various _LowerCaseQ type patters but it isn't working. I've also tried using StringSplit[#,""] to split everything and then finding the lower case characters and putting it back together but I haven't got it to work. Any solution would be greatly appreciated.

Answer

I propose:

StringCases[

  {"Fe3O4", "CO", "MgO", "Uut14AuO6"},
  DigitCharacter .. | (_?UpperCaseQ ~~ ___?LowerCaseQ)
]

{{"Fe", "3", "O", "4"}, {"C", "O"}, {"Mg", "O"}, {"Uut", "14", "Au", "O", "6"}}

Or as a RegularExpression:

StringCases[
  {"Fe3O4", "CO", "MgO", "Uut14AuO6"},

  RegularExpression["\\d+|[A-Z][a-z]*"]
]

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