What Do You Know About The Chemical Element Astatine?

Explanation
Emilio Segrè is the correct answer because he was one of the scientists who discovered the chemical element Astatine. Segrè was an Italian-American physicist who contributed to the discovery of several elements, including Astatine. He conducted research on the synthesis and identification of new elements, and in 1940, he successfully isolated Astatine for the first time. Segrè's work on Astatine and other elements earned him recognition and awards, including the Nobel Prize in Physics in 1959.

Explanation
Astatine has an atomic number of 85. The atomic number represents the number of protons in the nucleus of an atom. Since astatine has an atomic number of 85, it means that it has 85 protons.

Explanation
Astatine is a highly radioactive element, and its most stable isotope, Astatine-210, has a half-life of 8.1 hours. This means that it takes 8.1 hours for half of a sample of Astatine-210 to decay into other elements. The longer the half-life, the more stable the isotope is. Therefore, the fact that Astatine-210 has a half-life of 8.1 hours indicates that it is relatively stable compared to other isotopes of Astatine.

Explanation
Astatine is a chemical element with the symbol At. It is a highly radioactive element and belongs to the halogen group on the periodic table. The symbol "At" is derived from its name "Astatine".

Explanation
Astatine is a highly radioactive element and is the heaviest halogen. It is a solid at room temperature but has a very low melting point compared to other halogens. The correct answer is 302 °C because it is the closest option to the actual melting point of astatine, which is around 302 °C.

Explanation
Astatine has a boiling point of 336.8 °C. This means that at this temperature, astatine changes from a liquid to a gas state. Boiling point is a physical property that is specific to each substance and is determined by the strength of intermolecular forces. Astatine, being a halogen, has relatively weak intermolecular forces compared to other elements, which is why it has a lower boiling point compared to elements like iodine or bromine.

Explanation
Astatine is classified as a halogen based on its chemical and physical properties. Halogens are a group of highly reactive elements that are found in Group 17 of the periodic table. They have seven valence electrons, which makes them highly reactive and likely to form compounds with other elements. Astatine shares similar properties with other halogens like fluorine, chlorine, bromine, and iodine, such as high electronegativity and the ability to form stable halide compounds. Therefore, Astatine is correctly identified as a halogen.

Explanation
Astatine is found in group 17 on the periodic table. Group 17 is also known as the halogens, which are highly reactive nonmetals. Astatine is a rare and radioactive element that belongs to this group. It has properties similar to other halogens such as chlorine and iodine. Therefore, the correct answer is 17.

Explanation
The most abundant isotope of Astatine has 125 neutrons. Isotopes of an element have the same number of protons but different numbers of neutrons. Since the question asks for the most abundant isotope, we can assume that it refers to Astatine-125, which has 85 protons and 125 neutrons.

Explanation
Astatine is a radioactive element, and its most stable isotope is A-210. This means that A-210 has the longest half-life compared to the other isotopes listed. A longer half-life indicates greater stability because it takes a longer time for half of the atoms in a sample to decay. Therefore, A-210 is the most stable isotope of Astatine among the options given.