Q. Consider the following statements with regard to Copper (Cu), Silver (Ag), and Gold (Au):

1. They belong to the same group in the periodic table.
2. They exhibit high electrical and thermal conductivity.
3. They readily form complexes due to availability of d-orbitals.
4. They are highly reactive and easily found in nature as oxides.

Select the correct answer using the codes below:
Answer: 1, 2 and 3 only
Notes: Copper, silver, and gold are Group 11 elements, also called coinage metals. They have high electrical and thermal conductivity, and their filled d-orbitals facilitate complex formation. They are less reactive and often found in native or sulfide forms rather than as oxides. Thus, only statements 1, 2, and 3 are correct.