Question

Gadolinium belongs to 4f series. Its atomic number is 64. Which of the following is the correct electronic configuration of gadolinium?

• A. $\lbrack Xe\rbrack 4f^{7}5d^{1}6s^{2}$
• B. $\lbrack Xe\rbrack 4f^{6}5d^{2}6s^{2}$
• C. $\lbrack Xe\rbrack 4f^{8}6d^{2}$
• D. $\lbrack Xe\rbrack 4f^{9}5s^{1}$

Answer 1

Answer: (A)

$\lbrack Xe\rbrack 4f^{7}5d^{1}6s^{2}$

Answer 2

Z = 64; outer electronic configuration