Californium

Britannica Nobel Prizes: Californium - Overview and basic data.
www.britannica.com/nobel/micro/98_61.html

ChemGlobe: Californium - Electronic and thermal data along with an isotope table.
partisans.spurious.biz/~pkremer/projects/chemglobe/ptoe/_/98.html

ChemicalElements.com: Californium - Basic information, atomic structure, and isotopes table.
www.chemicalelements.com/elements/cf.html

EnvironmentalChemistry.com: Californium - Atomic structure, chemical and physical properties, and table of nuclides.
environmentalchemistry.com/yogi/periodic/Cf.html

It's Elemental: Californium - Basic physical and historical information.
education.jlab.org/itselemental/ele098.html

LANL: Californium - Basic information and history.
periodic.lanl.gov/elements/98.html

Lenntech: Californium - Physical data, chemical properties, health and environmental effects.
www.lenntech.com/Periodic-chart-elements/Cf-en.htm

Visual Elements: Californium - General and physical information, uses, and key isotopes.
www.chemsoc.org/viselements/pages/californium.html