Sometimes the names of the elements change. For example, element 105 used to have the symbol Ha (hahnium), but is known by Db (dubnium). I'm a little vague on the presently-accepted symbols/names of the elements and I don't think I'm the only one, so here's a list of element symbols
that aren't in use anymore.
To make sure you're good and confused, some elements still have names you may not recognize. I'm sure you can figure out aluminum and aluminium are two accepted names for the same element. Do you know which element is called jod
in certain countries? I'l give you a hint. Here's its picture.