12. Which pair of atomic mass number (A) and atomic number (Z) is of isotones? (A) (1) A = 30, Z = 15 (11) A = 31, Z= 14 (B) (1) A = 31, Z= 15 (ii) A = 30, Z = 14(C1) A = 32, Z = 15 () A = 30, Z = 14 (D) (i) A= 31. Z = 16 (ii)A = 32. Z = 14

12. Which pair of atomic mass number (A) and atomic number (Z) is of i

1.	12. Which pair of atomic mass number (A) and atomic number (Z) is of isotones? (A) (1) A = 30, Z = 15 (11) A = 31, Z= 14 (B) (1) A = 31, Z= 15 (ii) A = 30, Z = 14(C1) A = 32, Z = 15 () A = 30, Z = 14 (D) (i) A= 31. Z = 16 (ii)A = 32. Z = 14
Answer» tion:A(1),D(1)A(2),C(1)B(1),B(2),C(2)find the N this formulaP+N=A