help, can't empty my trash folder on external hdd

If the trash has nothing else important in it:

rm -rf /media/Elements/.Trash-1000/

You may want to try as root as well:

sudo rm -rf /media/Elements/.Trash-1000/

Another method would be to use srm - it would wipe over the data and remove it. It also shows if it is a hardlink etc.

If you need to install it:

 sudo apt-get install secure-delete

and then

srm -rf /media/Elements/.Trash-1000/