Quick Answer: What Substance Has The Longest Half Life?

What’s the rarest element?

AstatineDensity (near r.t.

) Astatine is a chemical element with the symbol At and atomic number 85.

It is the rarest naturally occurring element in the Earth’s crust, occurring only as the decay product of various heavier elements..

What is the most toxic gas?

nitrogenBut surprisingly, amongst all the toxic, corrosive, and otherwise nasty gases that exist in industry, the most deadly of them all is the one we breathe in the most – nitrogen. Nitrogen (N2) is an inert and invisible gas that makes up about 78% (by volume) of the air we breathe.

Is Darmstadtium radioactive?

Density (near r.t. ) Darmstadtium is a chemical element with the symbol Ds and atomic number 110. It is an extremely radioactive synthetic element. The most stable known isotope, darmstadtium-281, has a half-life of approximately 12.7 seconds.

How long until Chernobyl is safe?

Experts believe the areas around the Chernobyl nuclear power plant will remain uninhabitable for at least 20,000 years. The figure 20,000 years apply to the area around the power plant itself. Areas around the exclusion zone are thought to be uninhabitable for least 3,000 years according to some experts.

Why is a long half life dangerous?

A longer half-life means that the material decays more slowly. Given the same mass of radioactive material, it will be emitting fewer radioactive particles per minute. Thus anyone near the material will receive fewer radioactive particles per minute. The lower dose will produce fewer health effects.

Which element has a half life of only 8 seconds?

Meitnerium’sMeitnerium’s most stable isotope, meitnerium-278, has a half-life of about 8 seconds. It decays into bohrium-274 through alpha decay. Since only small amounts of meitnerium have ever been produced, it currently has no uses outside of basic scientific research.

How long is uranium’s half life?

The half-life of uranium-238 is about 4.5 billion years, uranium-235 about 700 million years, and uranium-234 about 25 thousand years.

What are the 92 natural elements?

Naturally Occurring ElementsElementSymbolAtomic No.TechnetiumTc89RutheniumRu90RhodiumRh91PalladiumPd9242 more rows

Is the reactor still burning at Chernobyl?

Early in the morning of April 26, 1986, the fourth reactor exploded at the Chernobyl nuclear power plant in Ukraine. 34 years later, Chernobyl radioactivity is still circulating. They are now the biggest fires ever recorded in the Chernobyl exclusion zone. …

Why is Element 92?

There are only 88 naturally-occurring chemical elements. … The elements 43, 61, 85 and 87 have no stable isotopes, and none of long half-life, so they are not naturally present. Small amounts are made in nuclear reactions induced by cosmic rays and nuclear tests, but these soon disappear.

Why is U 235 better than u 238?

U- 235 is a fissile isotope, meaning that it can split into smaller molecules when a lower-energy neutron is fired at it. … U- 238 is a fissionable isotope, meaning that it can undergo nuclear fission, but the neutrons fired at it would need much more energy in order for fission to take place.

Is a short half life good?

On the flip side, those with a short half-life become effective more quickly but are harder to come off of. In fact, drugs with very short half-lives can lead to dependency if taken over a long period of time. A drug’s half-life is an important factor when it’s time to stop taking it.

Which element has the shortest half life?

Uranium-234Uranium-234 has the shortest half-life of them all at 245,500 years, but it occurs only indirectly from the decay of U-238. In comparison, the most radioactive element is polonium.

Which is more dangerous a long or short half life?

In general there is an inverse relation between the half-life and the intensity of radioactivity of an isotope. Isotopes with a long half-life decay very slowly, and so produce fewer radioactive decays per second; their intensity is less. Istopes with shorter half-lives are more intense.

What is Franciums half life?

about 22 minutesFrancium’s most stable isotope, francium-223, has a half-life of about 22 minutes. It decays into radium-223 through beta decay or into astatine-219 through alpha decay.

What is the most dangerous atom?

PlutoniumSurely you know what Plutonium is. It’s one of the most dangerous, radioactive, toxic elements in the world. It’s used in atomic bombs and the production of nuclear energy. And it’s responsible for killing a massive number of people in the world, in mere seconds.

What is the most toxic metal on earth?

MercuryMercury. Mercury is considered the most toxic heavy metal in the environment. Mercury poisoning is referred to as acrodynia or pink disease.

How does half life affect danger?

Radioisotopes with short half-lives are dangerous for the straightforward reason that they can dose you very heavily (and fatally) in a short time. Such isotopes have been the main causes of radiation poisoning and death after above-ground explosions of nuclear weapons.