The most toxic material in the world is plutonium and its toxicity. An English blog by M Sadman Sifat Soumik.

 Introduction :

Plutonium is a radioactive chemical element and it's symbol Pu , atomic number 94. It is an  actinide metal of silvery-gray appearance that tarnishes when exposed to air, and forms a dull coating when oxidized. 

Symbol: Pu

Atomic number: 94

Electron configuration: [Rn] 5f67s2

Discovered: December 14, 1940

Discoverers: Joseph W. Kennedy, Arthur Wahl, Glenn T. Seaborg, Edwin McMillan

Uses :

Different uses have been found for plutonium. Plutonium-238 has been used to power batteries for some heart pacemakers, as well as provide a long-lived heat source to power NASA space missions. Like uranium, plutonium can also be used to fuel nuclear power plants.

Can you touch plutonium?

There is no health hazard from touching plutonium. Just wash your hands afterward so that any traces of it don't accidentally get inside you. It presents zero risk outside of the body. Plutonium is only a hazard if it gets inside you in large quantities: inhaled, ingested, or absorbed.

Can you touch plutonium?

There is no health hazard from touching plutonium. Just wash your hands afterward so that any traces of it don't accidentally get inside you. It presents zero risk outside of the body. Plutonium is only a hazard if it gets inside you in large quantities: inhaled, ingested, or absorbed.

Toxicity of Plutonium

Plutonium-238 has a half-life of 87.7 years and emits alpha particles. It is a heat source in radioisotope thermoelectric generators, which are used to power some spacecraft.

Plutonium has a half-life of about 24,000 years. And scientists have known for decades that even in small doses, it is highly toxic, leading to radiation illness, cancer and often to death.

All information is collected from Wikipedia, quora, etc.