Use the periodic table to give the electron configuration for each of the following atoms and ions.
(c) Co(V) in CoO₄^3–
(d) Co(IV) in CoF₆^2–

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Step 1: Determine the atomic number of cobalt (Co) from the periodic table, which is 27. This means a neutral cobalt atom has 27 electrons.

Step 2: Write the electron configuration for a neutral cobalt atom (Co). The electron configuration is: 1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^7.

Step 3: For Co(V) in CoO4^3-, determine the oxidation state. Co(V) means cobalt is in the +5 oxidation state. Subtract 5 electrons from the neutral cobalt electron configuration.

Step 4: For Co(IV) in CoF6^2-, determine the oxidation state. Co(IV) means cobalt is in the +4 oxidation state. Subtract 4 electrons from the neutral cobalt electron configuration.

Step 5: Adjust the electron configurations for Co(V) and Co(IV) by removing electrons starting from the outermost shell (4s) and then from the 3d subshell.

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Electron Configuration

Electron configuration describes the distribution of electrons in an atom's orbitals. It follows the Aufbau principle, which states that electrons fill lower-energy orbitals first, and is represented using a notation that indicates the energy levels and sublevels occupied by electrons. Understanding electron configuration is essential for predicting an element's chemical behavior and bonding characteristics.

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01:33

Electron Configuration Example

Oxidation States

Oxidation states indicate the degree of oxidation of an atom in a compound, reflecting the number of electrons lost, gained, or shared during chemical bonding. For transition metals like cobalt, oxidation states can vary, and they are crucial for determining the electron configuration of ions. Knowing the oxidation state helps in correctly assigning the number of electrons to be considered in the electron configuration.

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Oxidation Numbers

Ionic Compounds and Charge

Ionic compounds are formed when atoms transfer electrons, resulting in the formation of positively and negatively charged ions. The charge of the ions influences their electron configurations, as it determines how many electrons are lost or gained. For example, Co(V) indicates cobalt in a +5 oxidation state, while Co(IV) indicates a +4 state, which directly affects the electron configuration of these ions.

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