Protons, neutrons and electrons
Californium was discovered in 1950.
Up today californium sulfide was not prepared.
Californium make ionic bonds.
Probably yes (californium is a metal) but experimental data don't exist up today.
Californium was obtained in 1950 by bombarding curium with alpha particles.
Californium can react with the majority of non metals.
Yes, many laboratories in the world make studies on californium and on the applications of Cf.
Californium react with oxygen, nitrogen, sulfur, hydrogen, halogens, etc.
At room temperature californium is a solid metal.
Not californium, but neutrons emitted by californium.
Californium is radioactive and a strong neutrons emitter; californium can be lethal.
Californium is able to form a critical mass.