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7. 4 neutrons.

8.  7 amu.

9. Proton.

10. Electron.

11. Neutron.

12. Protons and neutrons.

Explanation:

Hello!

In this case, given the atomic structure of the considered element, we can answer the questions as shown below:

7. Since the neutrons are placed into the element's nucleus, and they are neutrally charged, we see there are 4 neutrons:

8.  Since the atomic mass of an element is computing by adding the number of protons and electrons, as this atom has three protons and four neutrons, its atomic mass is 7 amu.

9. Proton.

10. Electron.

11. Neutron.

12. Considering the given picture and the widespread atomic theories, we realize that inside the nucleus of an atom there are protons and neutrons.

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