Răspunsuri

2014-10-04T20:55:28+03:00
Nr protonilor=nr electronilor
=>protoni=11
A(nr de masa)=Z(nr protonilor)+N(nr neutronilor)
23=11+n
=>n=23-11
n=12
6 3 6
2014-10-04T20:56:05+03:00