![]() The electron configuration of iridium is much longer than aluminum. Another example is the electron configuration of iridium: However, because it is the most time consuming method, it is more common to write or see electron configurations in spdf notation and noble gas notation. This is why it is sometimes useful to think about electron configuration in terms of the diagram. Note that in the orbital diagram, the two opposing spins of the electron can be visualized. The block that the atom is in (in the case for aluminum: 3p) is where we will count to get the number of electrons in the last subshell (for aluminum this would be one electron because its the first element in the period 3 p-block). Also another way of thinking about it is that as you move from each orbital block, the subshells become filled as you complete each section of the orbital in the period. We know that aluminum completely fills the 1s, 2s, 2p, and 3s orbitals because mathematically this would be 2 2 6 2=12. Now we shall look at the orbitals it will fill: 1s, 2s, 2p, 3s, 3p. If we look at the periodic table we can see that its in the p-block as it is in group 13. Write the electron configuration for aluminum and iridium.Īluminum is in the 3rd period and it has an atomic number of Z=13. Table 1: Exceptions to Electron Configuration Trends The reason these exceptions occur is that some elements are more stable with fewer electrons in some subshells and more electrons in others (Table 1). For more information on how electron configurations and the periodic table are linked, visit the Connecting Electrons to the Periodic Table module.Īlthough the Aufbau rule accurately predicts the electron configuration of most elements, there are notable exceptions among the transition metals and heavier elements. The periodic table is an incredibly helpful tool in writing electron configurations. Using the periodic table to determine the electron configurations of atoms is key, but also keep in mind that there are certain rules to follow when assigning electrons to different orbitals. The s-block is the region of the alkali metals including helium (Groups 1
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