Astatine has many isotopes, each with its own half life. The longest in my list is At209 at 8.1 hours, and At215 is listed at 0.1 ms. The shortest are just listed as 'short' reflecting the small quantities.
The half-life of astatine-210, the most stable isotope of astatine, is approximately 8.1 hours. This means that it takes 8.1 hours for half of a sample of astatine-210 to decay into a different element.
The answer is Radium
Technetium-97 has the shortest half-life of any naturally occurring element, with a half-life of about 4.2 million years. Artificially produced elements typically have even shorter half-lives, with some lasting only fractions of a second.
After 6.4 seconds, there would be 0.3g of the original sample of Astatine-218 remaining unchanged. This is calculated by dividing the time elapsed by the half-life to determine the number of half-lives passed (6.4 s รท 1.6 s = 4 half-lives), then using this to calculate the remaining amount (1.2 g รท 2^4 = 0.3 g).
The normal phase of astatine at room temperature is a solid. Astatine is a halogen element that usually exists as a dark, metallic-looking solid.
The time it takes for half the atoms in a sample of a radioactive element to decay is called the half life.
As a radioactive element with a short half life astatine is dangerous.
Technetium-97 has the shortest half-life of any naturally occurring element, with a half-life of about 4.2 million years. Artificially produced elements typically have even shorter half-lives, with some lasting only fractions of a second.
The atomic mass of astatine is 209.9871 atomic mass units (amu). The atomic mass is given for the longest lived isotope of astatine, which is astatine-210, with a half life of 8.3 hours.
All the isotopes of astatine are radioactive and unstable; the most stable isotope is 210At with a half life of 8,1 hours.
The answer is Radium
It doesn't "go" anywhere. It radioactively decays and changes into a different element.
Astatine is the rarest naturally occuring element on Earth because all its isotopes are radioactive with very short half-lives. The most stable, At-210 has a half-life of 8 hours, so any astatine that forms (by radioactive decay of heavier elements) quickly decays to other elements.
All the isotopes of astatine are radioactive and has very short half lives; consequently is a dangerous element.
Astatine is not a diatomic element because it is in a group of halogens that are typically diatomic in nature, but astatine atoms are too large and unstable to form stable diatomic molecules. Its reactivity and nuclear instability make it difficult to exist as a diatomic molecule.
Different from what? Very little is known about the chemistry of astatine - it is radioactive and the most stable isotope has a half life of 7-8 hrs! As far as is known and that isn't far- astatine is most like iodine with ONs presumably of -1, 1, 3, 5, 7
The estimated boiling point is 338 0C; the color may be black. It is impossible for chemists to make a deep study of astatine because they have only very small quantities of this element; also astatine is radioactive, unstable, with a half-life of only 8,1 hours.
Astatine is a halogen because it shares similar chemical properties with other halogens, such as fluorine and chlorine. However, it is not a diatomic element like these because astatine atoms do not naturally form stable diatomic molecules due to their higher atomic weight and less favorable interatomic interactions.