Which of the following is the correct order of arrangement of the first five lanthanides according to atomic number?
A. La, Ce, Pr, Nd, Pm
B. La, Pr, Ce, Pm, Nd
C. La, Pr, Ce, Nd, Pm
D. La, Ce, Pr, Pm, Nd
Answer:A
Which of the following is the correct order of arrangement of the first five lanthanides according to atomic number?
A. La, Ce, Pr, Nd, Pm B. La, Pr, Ce, Pm, Nd C. La, Pr, Ce, Nd, Pm D. La, Ce, Pr, Pm, Nd