Răspunsuri

2014-09-09T22:21:05+03:00
Z litiu = 3e- => 1s2,2s1
Z = 3 si A = 7 => 3 electroni,3 protoni si 4 neutroni
Z azot = 7e- => 1s2,2s2,2p3
Z = 7 si A = 14 => 7 electroni,7 protoni si 7 neutroni
Z oxigen = 8e- => 1s2,2s2,2p4
Z = 8 si A = 16 => 8 electroni,8 protoni si 8 neutroni

1 3 1