Answer:
Step-by-step explanation:
If you look at an atom as a whole, it is electrically neutral and possesses no overall charge. The nucleus consists of Protons and neutrons, Protons have a positive charge and neutrons have no charge on them.
Hence, the nucleus of an atom is positively charged and is generally surrounded by one or more electrons.
The electrons on the other hand have a negative charge on them.
The sign convention for proton (+1), neutron(0) and electron(-1). The nucleus is very heavy but is very small compared to the overall size of an atom.