标题: chemisty 帮帮忙～ [打印本页] 作者: xing2009 时间: 2011-9-8 08:46 PM 标题: chemisty 帮帮忙～ define the term nucleon number(mass number) of an isotope。作者: C.YYang 时间: 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.作者: xing2009 时间: 2011-9-8 10:24 PM 回复 2#C.YYang