Final answer:
The element with seven electrons in the second energy level (n=2) is Nitrogen (N), which has an electron configuration of 2s22p3 in n=2.
Step-by-step explanation:
The element that has seven electrons in the energy level n=2 is Nitrogen (N). Nitrogen's electron configuration in this second energy level is 2s22p3, indicating it has 2 electrons in the 2s sublevel and 3 electrons in the 2p sublevel, adding up to a total of 5 electrons. Since it has an atomic number of 7, it also has 2 electrons in the first energy level (n=1), filling that level.
The second energy level (n=2) can accommodate a total of 8 electrons, according to the formula 2n2, which for n=2 equates to (2 * 22) = 8 electrons. In the case of Nitrogen, with 5 electrons already present in the n=2 level, it has space for 3 more, therefore, it does not have the maximum number of electrons in this level but satisfies the condition of having exactly 7 electrons in total across the first and second energy levels.