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physical object > natural object > collection of particles > phase of matter > solid > metal > actinide > actinium > actinium 225

actinium 225 (225Ac)
subject			fact

actinium 225	has symbol 225Ac
	has nuclear spin I = 3/2+
	has decay mode α (5.935 MeV)
	has decay mode γ
	has half life 10.0 days
	has number of nucleons 225
	has number of neutrons 136
	has atomic mass 225.023205
	has uses tracer
	is an instance of actinium
actinium	has longest lived isotope actinium 227
	has isotope mass range 209 to 232
	has number of isotopes 26
	has pronunciation ak-tin-iuhm
	has name origin aktinos from Greek word for 'ray'
	has discovery location Paris, France
	has abundance n.a. in Sun relative to H = 1 × 1012
	has abundance minute traces in Earth's crust
	has abundance nil in seawater
	has specimen not commerecially available
	has world production probably less than a gram
	has chief source uranium ore contain 0.2 p.p.m.
	has mass absorption coefficient cm2 g-1 for CuKα X-ray diffraction
	has mass absorption coefficient cm2 g-1 for MoKα X-ray diffraction
	has space group Fm3m
	has crystal cell dimension a = 531.1 pm
	has crystal type f.c.c.
	has atomic emission line 383.312 nm for Ac II
	has atomic emission line 408.844 nm for Ac II
	has atomic emission line 416.840 nm for Ac II (strong)
	has atomic emission line 438.641 nm for Ac II (strong)
	has atomic emission line 450.720 nm for Ac II
	has atomic emission line 591.085 nm for Ac II
	has term symbol 2D3/2 in ground state
	has electron configuration [Rn]6d17s2 in ground state
	has mass of element in person nil for a 70 kg average person
	has daily dietary intake nil
	has level in humans nil
	has hazard never encountered normally, dangerous because it is a powerful source of α-radiation, element found only inside nuclear facilities or research laboratories
	has biological role none
	has linear expansion coefficient 14.9 K-1
	has thermal conductivity 12 W m-1 K-1 at 300 K
	has molar volume 22.6 cm3
	has heat capacity 27.2 J K-1 mol-1 for solid at constant pressure 0.1 MPa at 298.15 K
	has heat capacity 20.84 J K-1 mol-1 for gas at constant pressure 0.1 MPa at 298.15 K
	has heat of sublimation 51.9 ± 0.5 kJ mol-1
	has heat of vaporization 418 kJ mol-1
	has heat of fusion 14.2 kJ mol-1
	has boiling point 3470 ± 300 K
	has melting point 1320 ± 50 K
	has electronegativity 1.1 Pauling
	has relative atomic mass 227.0728 for 227Ac in units of 12C = 12.000
	has ionic radii 118 pm for Ac3+
	has atomic radii 188 pm
	has number of protons 89
	has registry number 7440-34-8 for Chemical Abstracts System database
	has density 10060 kg m-3 for solid at 293 K
	has synthesis mechanism decay of uranium 235
	has synthesis mechanism bombardment of radium 236 with neutrons
	has atomic number 89
	reacts with water to release hydrogen gas
	has discovery date 1899
	has discoverer Andre Debierne
	has image
actinide	has filling orbital 5f
radioactive particle	has desintegration energy the total energy produced when the particle decays
	has decay products the products produced immediately after decay
	has lifetime The average time in which a particle decays
element	is a part of Universe
	has synonym atom
particle	obeys uncertainty principle
	has frequency inversely proportional to the wavelength
	has wavelength inversely proportional to its momentum
	has charge
	has mass
column grouped element	has group a column number in the table of the elements
physical object	has location or center of gravity
	has angular momentum
	has velocity
	has momentum
	has temperature
	has volume
	has extent
	has material

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