What element produces a vapor in comet tails?

[tony1107]

TL;DR

I would like to find out what element produces a vapor or a stream in a heavy charged ionic vacuum would lithium produce such a thing? Comet tails.. just wondering

I would like to find out what element produces a vapor or a stream in a heavy charged ionic vacuum would lithium produce such a thing? Comet tails.. just wondering

 

[Borek]

I am afraid the question as asked is just a word salad. Stream of what? What is a "heavy charged ionic vacuum"?

Comet tails are mostly composed not of elements, but of compounds. One of these compounds is water, and it gets split by the UV into hydrogen and oxygen. Googling for "comet tail composition".