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xing2009

2011-9-8 08:46 PM

define the term nucleon number(mass number) of an isotope。

C.YYang

2011-9-8 09:01 PM

nucleon number- number of protons and neutrons present in an atom
isotope - a same element with the same number of protons but have different neutron number
nucleon number of an isotope may vary even though it is the same element because of its different number of neutrons in it, such as carbon-12 and carbon-13.

xing2009

2011-9-8 10:24 PM

回复 2# C.YYang

这些我都懂～我是要我上面的问题的答案哦～

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