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Protactinium

A radioactive element.

Symbol: Pa

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Atomic number	91		Clip
Atomic / Molecular Weight	231.0359	gmol^-1	Clip
Density	15370	kgm^-3	Clip
Lattice constant	392	fm	Clip
Melting Point	1473	K	Clip
Boiling Point	4273	K	Clip
Specific heat capacity	121	Jkg^-1K^-1	Clip

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See also: Hann Otto, Meitner, Lise, Periodic Table.

Subjects: Chemistry