How many electrons are in the highest occupied energy level, n, of an element in Group 15?

5 Electrons.

Explanation:

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In this case, an element in group 15 such as nitrogen has 5 electrons on the outer shell because of its electron configuration. For N, whose atomic number is 7, the electron configuration is:

Whereas energy level 2 has 5 electrons (2 from 2s and 3 from 2p). Next element is phosphorous and its electrons configuration is:

It also has 5 electron on the energy level 3 (2 from 3d and 3 from 3p).

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a chemical change results in a new substance being formed; whereas a physical change will result in a different state of matter

explanation: