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7. 4 neutrons.

8.  7 amu.

9. Proton.

10. Electron.

11. Neutron.

12. Protons and neutrons.

Explanation:

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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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b. accuracy of the data matters alot more than its number of digits, organization or amount of detail. quantitative observation is more accepted than the qualitative observation.

it takes on an electronical energy