Now in this rhyme, you will find all the elements of a riddle,
All the clues are buried here, somewhere in the middle.
My first is in fact the last naturally to be seen,
I am in part a catalyst for refining gasoline.
My second is in party balloons they float up off the ground,
Although Noble I give your voice a tiny squeaking sound.
Equally noble is my third, I'm said to be mostly inert,
I'm used in incandescent lights so the filament won't get hurt.
My fourth is known as devilish stuff, of volcanoes I do smell,
Although no-one's been back to report, I'm supposed to stink like hell!
Finally I am used to make aeroplanes you can trust,
I'm light, I'm strong, I shine like new, I never, ever rust.
Put us all together, and you get what comes before,
Practice makes us perfect, go over it once more.
What am I?