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Encyclopedia
理学
放射性元素
释
radium
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天然放射性元素,元素符号Ra,原子序数88,半衰期最长的同位素的质量数226,属周期系ⅡA族,碱土金属元素。英文名来源于拉丁文radius(射线)。
Astronomy
全称:radium。缩写:Ra
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Chemistry
>放射化学与辐射化学>放射性元素化学>释义
radium
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随便看
vibrational quantum number
vibrational Raman spectrum
vibrational relaxation
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vibrational rotational model
vibrational-rotational model
vibrational-rotational spectrum
vibrational spectrum
vibrational spectrum of crystal
vibrational spectrum of crystals
vibrational state
vibrational structure
vibrational transition
vibration analysis of steam turbine
vibration analysis of structures
vibration and shock generating system
vibration and shock meter
vibration and shock metrology
vibration and shock transducer
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vibration cleaner
vibration control
vibration control of engineering structure
vibration control of rotor systems
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