Consider the solar system as a large atom. The quantum number (n) that characterises Earth’s orbit (radius = 1.5 × 1011 m) with Earth moving at an orbital speed of 3 × 104 m/s is (mass of Earth is 6 × 1024 kg):
1
2.56 × 1074
2
2.56 × 1039
3
2.56 × 1073
4
2.56