General electronic arrangement of actinoids is (n – 2)f1-14 (n – 1 )d0-2 ns2. Which of the accompanying actinoids have one electron in 6d orbital? (a) U (Atomic no. 92) (b) Np (Atomic no. 93) (c) Pu (Atomic no. 94) (d) Am (Atomic no. 95)