Read the passage and answer the question.

Nucleus of an atom is central dense mass consisting of protons and neutrons. If an atom is enlarged to the size of a classroom, the nucleus would be the size of a pinhead. In other words, an atom is almost empty. The size of a nucleus is that as compared to that of an atom.

Which of the following is true for nucleus?

It attracts negative charges

• Nucleus is electrically positive as it contains neutral neutrons and positive protons.
• The gravitational forces in case of nucleus is very small, too minute to actually play any part as the masses are incredibly small.
• Nucleus is a dense mass which contains all the mass of the atom which means it is too heavy compared to an electron.