Decide which of the following atomic numbers are the atomic numbers of the inner transition elements

(A) 59
(B) 95
(C) 102
(D) 74

Choose the correct answer from the options given below:

(A), (B) and (C) only

The correct answer is Option (2) → (A), (B) and (C) only

Inner transition elements are the f-block elements, consisting of the Lanthanides and Actinides.

• Lanthanides: Atomic numbers 57 (La) to 71 (Lu). They fill the 4f orbital.
• Actinides: Atomic numbers 89 (Ac) to 103 (Lr). They fill the 5f orbital.

The given atomic numbers:

• (A) 59: This is Praseodymium (Pr), which is in the Lanthanide series (4f block). (Inner transition)
• (B) 95: This is Americium (Am), which is in the Actinide series (5f block). (Inner transition)
• (C) 102: This is Nobelium (No), which is in the Actinide series (5f block). (Inner transition)
• (D) 74: This is Tungsten (W), which is a d-block transition element, not an inner transition element (it's in Group 6, Period 6). (Not inner transition)

Therefore, (A), (B), and (C) are atomic numbers of inner transition elements.