210Bi va 65Cu yadrolarining toqnashishi oqibatida 1 ta neytron va noma

50. (v15-105-5) 210Bi va 65Cu yadrolarining toqnashishi oqibatida 1 ta neytron va nomalum element yadrosi hosil boldi. Hosil bolgan yadroning massasini (A) va zaryadini (Z) aniqlang. A) 272; 113 B)275; 111 C)274; 112 D)144; 54