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Thank you for the response Mike but I'm not asking an editorial question. "What is...Actinide?" is just an example. I'm curious to know if the ellipse or other punctuation effects the weighting of my title or if Google basically  ignores it. When I search similar patterns with and without the ellipse I get the exact same search results.

I know that exact matches in the title tag are more powerful but how much will using an ellipse the title affect my results? For example I would like to use "What is… Actinide?" instead of "What is Actinide?"