Question

Write the electron configuration for the neutral atom or ion indicated in the space provided. It is OK to use the condensed notation in which the noble-gas core is represented using the appropriate symbol in square brackets. For example, the electron configuration of Al is [Ne]3s23p1

(a) Write the electron configuration of Sn (Z = 50).

(b) Write the electron configuration of Ni2+ (Z = 28).

(c) Write the electron configuration of Te2– (Z = 52).

(d) Write the electron configuration of Os (Z = 76).

(e) Write the electron configuration of Pb4+ (Z = 82).

Answer 1

a. Sn = 50      [Kr]4d¹⁰5s²5p²

b. Ni = 28     [Ar] 3d⁸4s²

Ni --------> Ni⁺²

   28e- 26e-

Ni⁺² =   [Ar] 3d⁸

C. Te = 52 =      [Kr]4d¹⁰5s²5p⁴       

Te +2e^- ------> Te^2-

52e^-                54e^-

Te2-   = [Kr]4d¹⁰5s²5p6

d. Os = 76 = [Xe]4f¹⁴ 5d⁶6s²

e. Pb =82= [Xe]4f¹⁴5d¹⁰6s²6p²

    Pb -------> Pb⁺⁴ +4e^-

   Pb⁺⁴     [Xe]4f¹⁴5d¹⁰