Xenon
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Xenon (Xe)
Only one chemical element begins with the letter X. Xenon is a chemical element. It has the symbol Xe. It is the only chemical element that begins with the letter x.
Xochimilco and Xanadu are two restaurants that start with "X".
The elements that start with the letter O are oxygen & Osmium.
A band that starts with the letter X is the rock band Xxile....they actually start with two X's