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All elements have a capital letter.... often taken from the first letter of their name in Latin.

Some only needed one letter because there was no confusion when they were being written.... Hydrogen was the only H at first, then when Helium was discovered the custom was that H stood for Hydrogen so it couldn't easily be changed, so Helium became He.... and so on.

There are no element symbols having 2 lowercase letters.

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14y ago

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