69. (v19/20-108-1) Element atomi yadrosida sodir boladigan qanday jarayonlarda elementning yadro zaryadi bir birlikka kamayadi?
1) protonning neytronga aylanishida;
2) neytronning protonga aylanishida;
3) elektronning yadroga qulashida;
4) yadrodan a-zarracha ajralishida.
A) 1,4 B)1,3
C) 2, 4
D) 2