Ch.2 - Atoms & Elements

Tro - Chemistry: A Molecular Approach 6th Edition

Tro6th EditionChemistry: A Molecular ApproachISBN: 9780137832217Non è quello che usi tu?Cambia libro di testo

Tro 6th Edition

Ch.2 - Atoms & Elements

Problema 72

Capitolo 2, Problema 72

Determine whether or not each element is a transition element. a. Cr b. Br c. Mo d. Cs

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Identify the location of each element on the periodic table. Transition elements are located in the d-block, which consists of groups 3 to 12.

Check the group number for Chromium (Cr). If it falls within groups 3 to 12, it is a transition element.

Examine the group number for Bromine (Br). If it is outside groups 3 to 12, it is not a transition element.

Look at the group number for Molybdenum (Mo). If it is within groups 3 to 12, it qualifies as a transition element.

Determine the group number for Cesium (Cs). If it falls outside groups 3 to 12, it is not a transition element.

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Transition Elements

Transition elements are defined as d-block elements that have partially filled d orbitals in one or more of their oxidation states. They typically exhibit properties such as the ability to form variable oxidation states, colored compounds, and catalytic activity. Understanding which elements fall into this category is essential for identifying transition metals.

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03:30

Transition Metals and Representative Elements

Periodic Table Groups

The periodic table is organized into groups and periods, with transition metals located in groups 3 to 12. Elements in these groups share similar properties due to their electron configurations. Recognizing the position of an element in the periodic table helps determine whether it is a transition metal or not.

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05:33

Periodic Table: Group Names

Electron Configuration

Electron configuration describes the distribution of electrons in an atom's orbitals. For transition metals, the presence of electrons in the d subshell is crucial for their classification. Analyzing the electron configurations of the given elements (Cr, Br, Mo, Cs) will clarify which are transition elements based on their d orbital occupancy.

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01:33

Electron Configuration Example

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Fill in the blanks to complete the table.

Symbol Ion Formed Number of Electrons in Ion Number of Protons in Ion

Cl ______ ______ 17

Te ______ 54 ______

Br Br^– ______ ______

______ Sr²⁺ ______ 38

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