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!

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