A) 247
B) 245
25. (v6-118-20) Quyida berilgan yadro reaksiyasida 7,77 mg nobeliy-259 yemirilganda 54,18-1018 dona elektron ajralganligi malum bolsa, hosil bolgan berkliy izotopining nisbiy atom massasini korsating. 289 No + 3y Bk + xa + y_p.
A) 247 B) 245
C) 232 D)243