Thallium was used as a poison in the Agatha Christie mystery...

Thallium was used as a poison in the Agatha Christie mystery story “The Pale Horse.” Thallium has two
possible cationic forms, +1 and +3. The +1 compounds are the more stable. Write the electron structure of the +1 cation of thallium.

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Key Concepts

Electron Configuration

Electron configuration describes the distribution of electrons in an atom’s orbitals. It follows principles such as the Aufbau principle, Pauli exclusion principle, and Hund’s rule to determine how electrons fill available subshells. This configuration is often written compactly using noble gas notation to denote core electrons.

Ion Formation and Oxidation States

Ion formation involves the loss or gain of electrons to form cations or anions, which are characterized by an oxidation state. For an element that forms a +1 ion, one electron is removed from its neutral electron configuration, typically from the highest energy (outermost) orbital. The stability of a particular oxidation state, such as the +1 state for thallium, can be understood by analyzing the resulting electron configuration.

Noble Gas Notation

Noble gas notation is a shorthand method for writing electron configurations by using the electron configuration of the nearest noble gas as a starting point. This technique simplifies the expression of electron configurations in heavier elements by condensing the core electron structure into a bracketed symbol representing a noble gas.

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