Identify the correct statements from the following: I. The de Broglie wavelength of a macroscopic object (like a cricket ball) is too small to be experimentally measurable. II. The size of a 5d orbital is less than that of a 4d orbital. III. In a single-electron species like the Hydrogen atom, the 2s and 2p orbitals have the same energy. IV. The ground state electronic configuration of Copper ( Z=29 ) is [ Ar ] 3d^9

Step-by-step solution

Statement I is correct. For macroscopic objects, the mass is relatively large, making their de Broglie wavelength ( = h mv ) extremely small and experimentally unmeasurable. Statement II is incorrect. The size of an orbital increases as the principal quantum number n increases. Therefore, the 5d orbital is larger than the 4d orbital. Statement III is correct. In single-electron species (like the H atom), the energy of an orbital depends only on the principal quantum number n . Thus, the 2s and 2p orbitals are degen