actinoid
Uranium's periodic family
Actinoid refers to any of the fifteen metallic elements in the periodic table with atomic numbers 89 through 103, beginning with actinium and ending with lawrencium.
These elements, also called actinides, share similar chemical properties and are all radioactive, with several occurring naturally while others are synthetic.
The most familiar actinoids are uranium and plutonium, both important in nuclear energy and weapons.
Actinide, atomic number ninety
- protactiniumActinide series element
- uraniumElement ninety-two
- neptuniumSynthetic radioactive metallic element
- plutoniumActinide, atomic number 94
americium · curium · berkelium · californium · einsteinium · fermium · transuranic · synthetic
Period for fifty-percent reduction
- fissionNuclear breakup releasing energy
- transmutationComplete change of form
- irradiationExposure to radiant energy
- contaminationIntroduction of impurities
Combining power measure
- coordinationOrganized cooperative movement
- chelationChemical metal-ion capture
- electronegativityAtomic electron attraction strength
- spectroscopyStudy of light-matter interaction
inorganic · synthesis · ionic · bonding · aqueous · compounds · fluorides · oxides
Controlled fission chambers
- weaponsTools for fighting
- plutonium-239Fissile actinide isotope
- uranium-235Fissile nuclear isotope
- breederOne who raises stock
Emanating from center
- sea-starSpiny-skinned ocean invertebrate
- marineRelating to the sea
- echinodermSpiny-skinned marine invertebrate
- regenerationBiological self-repair process
asteroid · invertebrate · reef · benthic · predator · bivalve
thorium
Actinide, atomic number ninety
- protactiniumActinide series element
- uraniumElement ninety-two
- neptuniumSynthetic radioactive metallic element
plutonium · americium · curium · berkelium · californium · einsteinium · fermium · transuranic · synthetic · radioactive
half-life
Period for fifty-percent reduction
- fissionNuclear breakup releasing energy
- transmutationComplete change of form
- irradiationExposure to radiant energy
contamination · shielding · dosimetry · curie
valence
Combining power measure
- coordinationOrganized cooperative movement
- chelationChemical metal-ion capture
- electronegativityAtomic electron attraction strength
spectroscopy · inorganic · synthesis · ionic · bonding · aqueous · compounds · fluorides · oxides · halides
reactors
Controlled fission chambers
- weaponsTools for fighting
- plutonium-239Fissile actinide isotope
- uranium-235Fissile nuclear isotope
radial
Emanating from center
- sea-starSpiny-skinned ocean invertebrate
- marineRelating to the sea
- echinodermSpiny-skinned marine invertebrate
regeneration · asteroid · invertebrate · reef · benthic · predator · bivalve