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physical object > natural object > collection of particles > phase of matter > solid > metal > actinide > transuranium element > americium > americium 240

americium 240 (240Am)
subject			fact

americium 240	has symbol 240Am
	has nuclear spin I = 3-
	has decay mode EC (1.38 MeV)
	has decay mode α (5.592 Mev)
	has decay mode γ
	has half life 2.12 days
	has number of nucleons 240
	has number of neutrons 145
	has atomic mass 240.055278
	is an instance of americium
americium	has phase changed temperature 1347 K at α to β phase crystal transition
	has mineral none
	has neutron scattering length 0.83 in 10-12 cm units
	has mass magnetic susceptibility +5 × 10-8 kg-1 m3
	has electrical resistivity 68 × 10-8 Ω m
	has thermal neutron capture cross section 75.3 barns
	has longest lived isotope americium 243
	has isotope mass range 227 to 247
	has number of isotopes 23 including nuclear isomers
	has pronunciation amer-is-iuhm
	has name origin america from English
	has discovery location Chicago, Illinois, US
	has abundance nil in Earth's crust
	has abundance nil in seawater
	has world production probably a few kilograms per year
	has space group P63/mmc for α phase
	has space group Fm3m for β phase
	has crystal cell dimension a = 346.80 pm for α phase
	has crystal cell dimension a = 489.4 pm for β phase
	has crystal type h.c.p. for α phase
	has crystal type f.c.c. for β phase
	has atomic emission line 367.312 nm for Am I
	has atomic emission line 377.750 nm for Am II
	has atomic emission line 392.625 nm for Am II
	has atomic emission line 408.929 nm for Am II
	has atomic emission line 428.926 nm for Am I
	has atomic emission line 450.945 nm for Am II
	has atomic emission line 457.559 nm for Am II
	has atomic emission line 466.279 nm for Am II
	has atomic emission line 605.464 nm for Am I (strong)
	has term symbol 8S7/2 in ground state
	has electron configuration [Rn]5f77s2 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 intense α-radiation, maximum permissible body burden of 241Am is 0.03 μCi - it targets bone. γ radiation is a problem in gram amounts.
	has biological role none
	has thermal conductivity 10 W m-1 K-1 at 300 K
	has molar volume 17.78 cm3
	has heat of sublimation 34.2 kJ mol-1
	has heat of vaporization 284 kJ mol-1
	has heat of fusion 14.4 kJ mol-1
	has boiling point 2880 K
	has melting point 1445 K
	has electronegativity 1.3 Pauling
	has relative atomic mass 243.0614 for americium 243 in units of 12C = 12.000
	has ionic radii 80 pm for Am6+
	has ionic radii 86 pm for Am5+
	has ionic radii 92 pm for Am4+
	has ionic radii 107 pm for Am3+
	has atomic radii 173 pm
	has number of protons 95
	has registry number 7440-35-9 for Chemical Abstracts System database
	has density 13670 kg m-3 for solid at 293 K
	has atomic number 95
	reacts with air, steam and acids, but not alkalis
	has discovery date 1944
	has discoverer Glen T. Seaborg, R.A. James, L.O. Morgan, and A. Ghiorso
	has uses source of radiation for γ-radiotherapy
	has image
synthetic element	has lifetime
	has synthesis mechanism
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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