How many times greater is the radius of an electron cloud compared to its nucleus?

The radius of an electron cloud is significantly larger than that of a nucleus in an atom due to the expansive nature of electron orbitals. Typically, the radius of an atom, which is determined by the electron cloud, is about 10,000 times greater than the size of its nucleus. The nucleus, consisting of protons and neutrons, is incredibly small compared to the region where electrons are likely to be found, which is defined by their energy levels and probability distributions.

This vast difference in size is crucial for understanding atomic structure. The electron cloud represents the area in which electrons are most likely to be found, while the nucleus contains most of the atom's mass in a much smaller volume. Therefore, when considering the comparative sizes, the correct choice illustrates this fundamental aspect of atomic structure, highlighting the disparity between the dimensions of the nucleus and the extent of the electron cloud surrounding it.