Passage VI

An atomic orbital can contain 0, 1, or 2 electrons. It is filled when it contains 2 electrons. An orbital's location and shape are determined by its energy level and sublevel. Table 1 lists the first 4 energy levels, their sublevels, and the number of orbitals in each sublevel.

Table 2 names each of the sublevels in the first 4 energy levels.

Table 3 shows the order in which the sublevels are filled with electrons. Each sublevel must be filled before an electron can be added to the next sublevel.

Tables 4 illustrates a notation used to indicate the number of electrons per sublevel.

Tables adapted from Kenneth W. Whitten and Kenneth D. Gailey, General Chemistry. ©1981 by Saunders College Publishing.

34. The pattern depicted in Table 3 does not work chromium, which has 24 electrons. Compared to vanadium, which has 23 electrons, chromium has 1 less 4s electron and 2 more 3d electrons. Based on this information, which of the following notations best represents the electron distribution in chromium?

Answer and Explanation

Your Answer is

Correct Answer is G

Explanation

There is one less electron on the 4s layer, and two more electrons on the 3d layer, so it should be 1s22s22p63s< sup>23p64s13d5