Answer 1

Atomic number	Electronic configuration
61	`[Xe]^54 4f^5 5d^(0)6s^2`
91	`[Rn]^86 5f^26d^17s^2`
101	`[Rn]^86 5f^135d^07s^2`
109	`[Rn]^86 5f^(14)6d^7 7s^2`