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The atomic mass of copper is 63.55 amu.There are only

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The atomic mass of copper is 63.55 amu.There are only
two isotopes of copper,63Cu with a mass of 62.93 amu and
65Cu with a mass of 64.93 amu.What is the percentage
abundance of each of these two isotopes?
The atomic mass of copper is 63.55 amu.There are only
铜的原子量是63.55 amu.铜只有两个同位素：铜63（质量62.93 amu）和铜65（质量64.93 amu）.分别求这两个同位素的百分比含量.
设铜63含量x
63.55=62.93x+64.93(1-x)
解得x=69%
则铜63占69%,铜65占31%
The atomic mass of copper is 63.55 amu.There are only 2道物理题,explain why the relative atomic mass of the atom is le why is this the relative atomic mass of chlorine not a whole how to coculate the atomic mass of an element 翻译the masses are all in atomic mass units（物理的） 翻译：A neutron is a nuclear particle with an atomic mass of 2. CHEMISTRY-RELATIVE ATOMIC MASS Silver is the best conductor of electricity,copper it closel sivler is the best conductor of electricity,copper _ it. There are only a______number of students playing on the play 英语翻译A sigma is formed when there is end-on overlap of atomic one of the boxes are/ is there.