An atom with 35 electrons will have its electrons distributed according to the Aufbau principle, filling lower energy levels before higher ones. The l = 2 subshell, which corresponds to the d subshell, can hold a maximum of 10 electrons. For a 35-electron atom, the electron configuration would fill the 1s, 2s, 2p, 3s, 3p, 4s, and 3d subshells before reaching the 4p subshell. Thus, the l = 2 subshell contains 10 electrons. Understanding the distribution of electrons in subshells is crucial for grasping atomic structure.