Answer:
B. 2p6
The properties of elements depend mainly on the arrangement of electrons outside the nucleus. Although there are other known particles in an atom, only the electron is located outside the nucleus. The arrangement of electrons in the orbitals of an atom is called electron configuration. The quantum mechanical model gives information about the energy of the electron. The model also describes the region of space around the nucleus as consisting of shells. These shells are also called principal or main energy levels. The principal energy levels or shells may have one or more sublevels. These sublevels are assigned with letters: s, p, d, f, and g. Refer to the attached picture for the principal energy levels and sublevels of electrons.
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