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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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a saline water is fed to a reverse osmosis unit at flow rate o rotameter connected to reject (retentate) line reads 8 installed in reject and permeate line reads 15.2 milli siemens/cm and 300 micro siemens/com respectively.

it can be observed without changing the identity of the object.

it depends on what substance you're talking about as well as many other factors. in quantum mechanics, the observation of particles affects the observers ability to measure certain properties. for example: you can know the velocity of a particle, but you can't know it's position; or you can know it's position, but not it's velocity. it's like trying to find out where a grain of sand is by throwing other grains of sand at it. once you find out where it is, it's been moved. it's also like trying to find an answer to the question of whether or not a tree falling in a forest makes a sound if nobody is there to hear it. paradoxically, the only way to find out is to be there and hear it.