Question

The element with electronic configuration `[Rn] 5f^2 6d^1 7s^2` has atomic number
A. 90
B. 91
C. 95
D. 100

Answer 1

Correct Answer - B
`[Rn] 5f^2 6d^1 7s^2` Atomic no. 91
86+2+1+2=91 Atomic no. of Rn =86