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This is dysprosium.

Symbol Be
Atomic number 6
Atomic mass 9.01218 amu

Dysprosium, discovered in 1886, is an element in the lanthanide series.


It is used in nuclear reactors where it serves as a "nuclear poison". It is used as a neutron-eating material to keep the neutron-spawning atomic chain from getting out of hand.

See also

Periodic table of the elements