The element europium exists in nature as two isotopes:151Eu hasa mass of 150.9196amu,and 153Eu has a mass of 151.96amu.Calculate the relative abundance of the two europium isotopes.请大虾们顺便说说isotopes(同位素)的用法（公式 用途

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The element europium exists in nature as two isotopes:151Eu hasa mass of 150.9196amu,and 153Eu has a mass of 151.96amu.Calculate the relative abundance of the two europium isotopes.请大虾们顺便说说isotopes(同位素)的用法（公式 用途
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The element europium exists in nature as two isotopes:151Eu hasa mass of 150.9196amu,and 153Eu has a mass of 151.96amu.Calculate the relative abundance of the two europium isotopes.请大虾们顺便说说isotopes(同位素)的用法（公式 用途
The element europium exists in nature as two isotopes:151Eu has
a mass of 150.9196amu,and 153Eu has a mass of 151.96amu.Calculate the relative abundance of the two europium isotopes.
请大虾们顺便说说isotopes(同位素)的用法（公式 用途之类的）谢谢~

The element europium exists in nature as two isotopes:151Eu hasa mass of 150.9196amu,and 153Eu has a mass of 151.96amu.Calculate the relative abundance of the two europium isotopes.请大虾们顺便说说isotopes(同位素)的用法（公式 用途
-0- 英英英英英文题!
照我欠缺的英文能力来理解,大概amu表示量是伐?那么（151×150.9196+153×151.96）÷（150.9196+151.96）=152
算元素的平均分子量就是 各同位素相对原子质量×丰度.
丰度就是该原子的数量占该元素所有原子数量的百分比.假设有10个151EU 30个153EU的话,151EU的丰度就是25% 我上面的运算如果分式分离的话就是我说的这个公式

The element europium exists in nature as two isotopes:151Eu hasa mass of 150.9196amu,and 153Eu has a mass of 151.96amu.Calculate the relative abundance of the two europium isotopes.请大虾们顺便说说isotopes(同位素)的用法（公式 用途 求《The element song》元素周期表之歌mp3版!歌词：There's antimony, arsenic, aluminum, selenium,And hydrogen and oxygen and nitrogen and rhenium,And nickel, neodymium, neptunium, germanium,And iron, americium, ruthenium, uranium,Europium, the element of THE ELEMENT怎么样 The TEXTAREA element是什么意思 求翻译“brave the element” 第五元素 THE FIFTH ELEMENT怎么样 The element of fire.Constructive,destructive. 【元素周期表之歌 the element song】 歌词急~ 元素周期表之歌 the element song mp3 Your browser does not support the canvas element The content of element type penguins must match (penguins)+ . what are some uses of the element不要翻译机 Confidence is the most important element of success physical education is vital element of the traditional education. android eclipse中的错误：The element must be a direct child of the element这个怎么解决. element是什么意思 element是什么意思