Answers

2014-01-06T17:59:48+08:00
Hi Mipeizhi the mass of that atom is 54 because all you need to get  the mass of an atom is proton and neutron (P plus N)  . Just to add it up some lesson . Proton and Electron is used to measure the charGe of an atom by this formula : ( P - E ) . Thats all :)
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