The element with 7 protons, 7 valence electrons, and 18 neutrons is nitrogen (N).
Nitrogen has an atomic number of 7, which indicates the number of protons in its nucleus. The valence electrons are the electrons in the outermost shell of an atom, and for nitrogen, there are 7 valence electrons in the second energy level. The number of neutrons can be calculated by subtracting the atomic number (number of protons) from the atomic mass. In this case, the atomic mass is 7 (protons) + 18 (neutrons) = 25.
Therefore, the element with these properties is nitrogen (N).