Cesium is a naturally occurring element, and is found commonly on Earth. It is not a human creation, though certain specific isotopes may be.
Cesium Sulfide
No, cesium has no odor.
No, cesium is an element.
Cesium doesn't have a smell you need special equipment to detect Cesium.
No cesium is a solid metal.
Cesium is extremely reactive.
cesium will sink
Yes, Cesium cyanide is soluble as are all cesium compounds.
The high reactivity of cesium comes from its tendency to give up the one electron in its outermost shell and become a cesium 1+ ion, which is more stable. In cesium chloride, the cesium is already in its stable ionic form.
Cesium doesn't have a smell you need special equipment to detect Cesium.
Only one naturally occurring isotope of cesium is known, cesium-133 (133Cs) which is not radioactive. A number of artificial radioactive isotopes of cesium are known also. One radioactive isotope of cesium is of special importance, cesium-137. It is produced in nuclear fission reactions. Read more on cesium in the link below.
Cesium Chromate = Cs2CrO4