Definition of astatine in English:

astatine

noun ˈastətiːnˈæstəˌtin

mass noun

The chemical element of atomic number 85, a radioactive member of the halogen group. Astatine was first produced by bombarding bismuth with alpha particles, and it occurs in traces in nature as a decay product.
（化学元素）砹（符号： At ）
Example sentencesExamples
- There is evidence that astatine behaves like iodine in the body.
- The bismuth target is cooled during irradiation to prevent the volatile astatine disappearing.
- By one estimate, no more than a millionth of a gram of astatine has ever been produced in the lab.
- The total amount of astatine present in the earth's crust, however, is probably less than 1 oz.
- The halogens are a group of chemical elements that includes fluorine, chlorine, bromine, iodine, and astatine.
- However, astatine also shows similarities to polonium and bismuth.
- This, together with its short lifetime, leaves no reason for considering the effects of astatine on human health.

Origin

1940s: from Greek astatos 'unstable' + -ine⁴.

Definition of astatine in US English:

astatine

nounˈastəˌtēnˈæstəˌtin

The chemical element of atomic number 85, a radioactive member of the halogen group. Astatine was first produced by bombarding bismuth with alpha particles, and it occurs in traces in nature as a decay product.
（化学元素）砹（符号： At ）
Example sentencesExamples
- By one estimate, no more than a millionth of a gram of astatine has ever been produced in the lab.
- The bismuth target is cooled during irradiation to prevent the volatile astatine disappearing.
- There is evidence that astatine behaves like iodine in the body.
- However, astatine also shows similarities to polonium and bismuth.
- The total amount of astatine present in the earth's crust, however, is probably less than 1 oz.
- This, together with its short lifetime, leaves no reason for considering the effects of astatine on human health.
- The halogens are a group of chemical elements that includes fluorine, chlorine, bromine, iodine, and astatine.

Origin

1940s: from Greek astatos ‘unstable’ + -ine.

词汇	astatine
释义	Definition of astatine in English: astatine noun ˈastətiːnˈæstəˌtin mass noun The chemical element of atomic number 85, a radioactive member of the halogen group. Astatine was first produced by bombarding bismuth with alpha particles, and it occurs in traces in nature as a decay product. （化学元素）砹（符号： At ） Example sentencesExamples There is evidence that astatine behaves like iodine in the body. The bismuth target is cooled during irradiation to prevent the volatile astatine disappearing. By one estimate, no more than a millionth of a gram of astatine has ever been produced in the lab. The total amount of astatine present in the earth's crust, however, is probably less than 1 oz. The halogens are a group of chemical elements that includes fluorine, chlorine, bromine, iodine, and astatine. However, astatine also shows similarities to polonium and bismuth. This, together with its short lifetime, leaves no reason for considering the effects of astatine on human health. Origin 1940s: from Greek astatos 'unstable' + -ine⁴. Definition of astatine in US English: astatine nounˈastəˌtēnˈæstəˌtin The chemical element of atomic number 85, a radioactive member of the halogen group. Astatine was first produced by bombarding bismuth with alpha particles, and it occurs in traces in nature as a decay product. （化学元素）砹（符号： At ） Example sentencesExamples By one estimate, no more than a millionth of a gram of astatine has ever been produced in the lab. The bismuth target is cooled during irradiation to prevent the volatile astatine disappearing. There is evidence that astatine behaves like iodine in the body. However, astatine also shows similarities to polonium and bismuth. The total amount of astatine present in the earth's crust, however, is probably less than 1 oz. This, together with its short lifetime, leaves no reason for considering the effects of astatine on human health. The halogens are a group of chemical elements that includes fluorine, chlorine, bromine, iodine, and astatine. Origin 1940s: from Greek astatos ‘unstable’ + -ine.
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