Absorbing neutrons
very reactive
I'm never found free
not very attractive
a rare earth element
I'll go straight to your head
Divalent I'm blue
but trivalent I'm red

I'm a dope for glass, but not like opium
I screen for down syndrome I am Europium

number sixty three
found by Paul Lecoq
used to understand the process
that leads to igneous rock
named after Europe
that I'm sure you knew
a Poisson ratio of point one fifty two

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