actinium
Glows blue, radioactive
Actinium is a radioactive metallic element, atomic number 89, that glows faintly blue in the dark.
It heads the actinide series of elements on the periodic table.
Rare in nature and difficult to isolate, actinium has limited practical applications but serves in research on radioactive decay and as a source of neutrons.
Systematic display of elements
- atomic numberProton quantity per nucleus
- protonsPositive nuclear particles
- electronsNegative charges in atoms
- neutronsUncharged subatomic particles
nucleus · atomic mass · valence · electronegativity · ionization · chemical bonds · reactivity · crystal structure
Late Victorian date
- pitchblendePrimary uranium ore
- isolationComplete separation from others
- FrenchOf or from Paris's nation
- rare earthMetallic elements, often mined together
Emission of helium nuclei
- half-lifePeriod for fifty-percent reduction
- radioisotopeUnstable atomic nucleus variant
- gamma raysHighest-frequency electromagnetic radiation
- beta particlesElectrons from radioactive decay
transmutation · ionizing · curie · nuclear · radionuclide · emission · disintegration
Medical radiation for cancer
- cancer treatmentMedical intervention for malignancy
- nuclear medicineHealthcare using radioactive materials
- researchSystematic fact-finding effort
- thermoelectricHeat-to-electricity converting
periodic table
Systematic display of elements
- atomic numberProton quantity per nucleus
- protonsPositive nuclear particles
- electronsNegative charges in atoms
neutrons · nucleus · atomic mass · valence · electronegativity · ionization · chemical bonds · reactivity · crystal structure · metallic
1899
Late Victorian date
- pitchblendePrimary uranium ore
- isolationComplete separation from others
- FrenchOf or from Paris's nation
Marie Curie · Pierre Curie · rare earth · spectroscopy · emanation
alpha decay
Emission of helium nuclei
- half-lifePeriod for fifty-percent reduction
- radioisotopeUnstable atomic nucleus variant
- gamma raysHighest-frequency electromagnetic radiation
beta particles · transmutation · ionizing · curie · nuclear · radionuclide · emission · disintegration
radiotherapy
Medical radiation for cancer
- cancer treatmentMedical intervention for malignancy
- nuclear medicineHealthcare using radioactive materials
- researchSystematic fact-finding effort
- elementsoxygen, hydrogen, carbon, helium, nitrogen
- metalsaluminum, steel, copper, iron, gold
- Radioactive Elementsuranium, plutonium, radium, radon, thorium
- heavy metalslead, gold, platinum, mercury, uranium
- Actinidesamericium, berkelium, californium, curium, einsteinium
- radioactive materialsuranium, plutonium, radium, thorium, radon