Oh, dude, molecule x-y-x has a linear shape with bond angles of 180 degrees. It's like a straight line, you know? So, if you're ever in a geometry competition and they ask about x-y-x, just remember it's as straight as a ruler.
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The shape of a molecule with the general formula X-Y-X depends on the number of lone pairs on the central atom Y. If Y has no lone pairs and the surrounding atoms X are the same, the molecule will have a linear shape with bond angles of 180 degrees. If Y has one or more lone pairs, the shape will be trigonal planar, bent, or another shape depending on the number of lone pairs and atoms attached to Y. The bond angles in these cases will deviate from the ideal angles due to lone pair repulsion.
Well, darling, molecule x-y-x is linear with bond angles of 180 degrees. It's like a straight line, no frills or fuss. Just two atoms bonded to a central atom, keeping it simple and straightforward.
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All sequences of the form XYX or XXX are palindromes: thus 000, 010, 020 … through 090, and again for every other digit (101, 111, 121, … 191). There are ten of these for each digit, none of which repeat, so 100 total. Please note that WikiAnswers is not here to do your homework for you. If this question is from work you have been assigned by a teacher or professor, I suggest you do the work yourself instead, which will help to increase your understanding of the subject matter and help you to become more familiar with it.