What is the charge of the nucleus of any atom?

The charge of the nucleus of any atom is positive due to the presence of protons. Protons carry a positive electric charge, while neutrons, which are also found in the nucleus, do not have any charge (they are neutral). The overall positive charge of the nucleus is a fundamental characteristic of atoms, and it is this positive charge that attracts the negatively charged electrons, allowing them to orbit the nucleus. The balance between the number of protons and electrons within a neutral atom ensures stability and retains the overall charge neutrality of that atom.

In contrast, options that refer to the nucleus as having a negative charge or being neutral do not align with the established principles of atomic structure. Additionally, stating that the charge is variable contradicts the consistent nature of the nucleus, which always remains positively charged due to the protons present.