How is the nuclear structure of an atom similar to the nonnuclear structure?

It has shells of protons and neutrons.

Explanation:

Protons and neutrons, collectively called nucleons, are packed together tightly in a nucleus. With a radius of about 10−15 meters, a nucleus is quite small compared to the radius of the entire atom, which is about 10−10 meters. Nuclei are extremely dense compared to bulk matter, averaging 1.8 ×× 1014 grams per cubic centimeter. For example, water has a density of 1 gram per cubic centimeter, and iridium, one of the densest elements known, has a density of 22.6 g/cm3. If the earth’s density were equal to the average nuclear density, the earth’s radius would be only about 200 meters (earth’s actual radius is approximately 6.4 ×× 106 meters, 30,000 times larger). [link] demonstrates just how great nuclear densities can be in the natural world.

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a) the particles of the chair are strongly held together.