Textbook Question
Which of the following are ionic, and which are molecular? (h) N2O4
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Ch.2 - Atoms, Molecules, and Ions
Chapter 2, Problem 68
Selenium, an element required nutritionally in trace quantities, forms compounds analogous to sulfur. Name the following ions: (a) SeO42- (b) Se2- (c) HSe- (d) HSeO3-.
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Identify the central element in the ion, which is selenium (Se).
Recognize that the ion is analogous to a sulfur-based ion, specifically sulfate (SO_4^{2-}).
Recall that the naming convention for the sulfate ion (SO_4^{2-}) is based on the central element sulfur (S) and the suffix '-ate'.
Apply the same naming convention to selenium, replacing 'sulfate' with 'selenate' to reflect the central element.
Conclude that the name of the ion SeO_4^{2-} is 'selenate'.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Selenium Chemistry
Selenium (Se) is a nonmetal that shares chemical properties with sulfur due to its position in Group 16 of the periodic table. It can form various compounds, including selenates and selenites, which are analogous to sulfates and sulfites, respectively. Understanding selenium's behavior in compounds is essential for identifying its ions.
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Polyatomic Ions
Polyatomic ions are ions composed of two or more atoms that are covalently bonded and carry a net charge. The ion SeO4^2- is known as selenate, which consists of one selenium atom bonded to four oxygen atoms, resulting in a -2 charge. Recognizing the structure and charge of polyatomic ions is crucial for naming and understanding their properties.
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Ionic Nomenclature
Ionic nomenclature is the system used to name ionic compounds and their constituent ions. For polyatomic ions like selenate (SeO4^2-), the name reflects the central atom and its oxidation state, along with the suffix indicating the type of ion. Familiarity with naming conventions helps in accurately identifying and communicating about chemical species.
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