Definition of radium in English:

radium

noun ˈreɪdɪəmˈreɪdiəm

mass noun

The chemical element of atomic number 88, a rare radioactive metal of the alkaline earth series. It was formerly used as a source of radiation for radiotherapy.
（化学元素）镭（符号： Ra ）
Radium is the most reactive member of the alkaline earth metals. It is rare in nature, occurring chiefly as an impurity in uranium ores. Radium was formerly used extensively in the treatment of tumours and in luminous materials, but it has now been largely replaced by other substances for these purposes
Example sentencesExamples
- The ability of radioactive substances such as radium to radiate energy, apparently spontaneously and continuously, appeared to contradict the law of the conservation of energy.
- Initial autopsies showed high amounts of radium and cesium in four deer livers.
- All isotopes of radium are radioactive with radium - 226 being the most stable.
- Rutherford was studying the structure of matter by bombarding a very thin gold foil with the alpha radiation from radium and polonium.
- Radon is present in the atmosphere because it is constantly being formed during the radioactive decay of uranium and radium.

Origin

Late 19th century: from Latin radius 'ray' + -ium.

Rhymes

palladium, stadium, vanadium

Definition of radium in US English:

radium

nounˈreɪdiəmˈrādēəm

The chemical element of atomic number 88, a rare radioactive metal of the alkaline earth series. It was formerly used as a source of radiation for radiotherapy.
（化学元素）镭（符号： Ra ）
Radium is the most reactive member of the alkaline earth metals. It is rare in nature, occurring chiefly as an impurity in uranium ores. Radium was formerly used extensively in the treatment of tumours and in luminous materials, but it has now been largely replaced by other substances for these purposes
Example sentencesExamples
- Rutherford was studying the structure of matter by bombarding a very thin gold foil with the alpha radiation from radium and polonium.
- Radon is present in the atmosphere because it is constantly being formed during the radioactive decay of uranium and radium.
- The ability of radioactive substances such as radium to radiate energy, apparently spontaneously and continuously, appeared to contradict the law of the conservation of energy.
- Initial autopsies showed high amounts of radium and cesium in four deer livers.
- All isotopes of radium are radioactive with radium - 226 being the most stable.

Origin

Late 19th century: from Latin radius ‘ray’ + -ium.

词汇	radium
释义	Definition of radium in English: radium noun ˈreɪdɪəmˈreɪdiəm mass noun The chemical element of atomic number 88, a rare radioactive metal of the alkaline earth series. It was formerly used as a source of radiation for radiotherapy. （化学元素）镭（符号： Ra ） Radium is the most reactive member of the alkaline earth metals. It is rare in nature, occurring chiefly as an impurity in uranium ores. Radium was formerly used extensively in the treatment of tumours and in luminous materials, but it has now been largely replaced by other substances for these purposes Example sentencesExamples The ability of radioactive substances such as radium to radiate energy, apparently spontaneously and continuously, appeared to contradict the law of the conservation of energy. Initial autopsies showed high amounts of radium and cesium in four deer livers. All isotopes of radium are radioactive with radium - 226 being the most stable. Rutherford was studying the structure of matter by bombarding a very thin gold foil with the alpha radiation from radium and polonium. Radon is present in the atmosphere because it is constantly being formed during the radioactive decay of uranium and radium. Origin Late 19th century: from Latin radius 'ray' + -ium. Rhymes palladium, stadium, vanadium Definition of radium in US English: radium nounˈreɪdiəmˈrādēəm The chemical element of atomic number 88, a rare radioactive metal of the alkaline earth series. It was formerly used as a source of radiation for radiotherapy. （化学元素）镭（符号： Ra ） Radium is the most reactive member of the alkaline earth metals. It is rare in nature, occurring chiefly as an impurity in uranium ores. Radium was formerly used extensively in the treatment of tumours and in luminous materials, but it has now been largely replaced by other substances for these purposes Example sentencesExamples Rutherford was studying the structure of matter by bombarding a very thin gold foil with the alpha radiation from radium and polonium. Radon is present in the atmosphere because it is constantly being formed during the radioactive decay of uranium and radium. The ability of radioactive substances such as radium to radiate energy, apparently spontaneously and continuously, appeared to contradict the law of the conservation of energy. Initial autopsies showed high amounts of radium and cesium in four deer livers. All isotopes of radium are radioactive with radium - 226 being the most stable. Origin Late 19th century: from Latin radius ‘ray’ + -ium.
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