I contain a tin ion

And you cannot find me in a crayon
___

But don't worry little peon

You can find me in a swan

You can find me in a heron

You can even find me in a fawn

___
You need me to move

Without me you will just be like a puddle of goo


____

You should not let me touch others like me

I promise you, I'm worse than an angry bee
___

Beware my wrath,

It's worse than an icy cold bath

But on the upside - I can help you do math!
___

To get your answer accepted you need to get the word and explain what most of the lines/groups of lines refer to