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Chapter 2: Problem 60

The most common charge associated with selenium is \(2-.\) Indicate the chemical formulas you would expect for compounds formed between selenium and (a) barium, (b) lithium, (c) aluminum.

Short Answer

Expert verified
The chemical formulas for compounds formed between selenium and the given elements are: (a) Barium - \(BaSe\), (b) Lithium - \(Li_2Se\), and (c) Aluminum - \(Al_2Se_3\).

Step by step solution

01

Determine the charges of the elements

First, identify the charges of each of the elements. Selenium (Se) has a 2- charge. Barium (Ba) is a Group 2 element, so it has a 2+ charge. Lithium (Li) is a Group 1 element (alkali metal), so it has a 1+ charge. Aluminum (Al) is a Group 13 element, and it has a 3+ charge.
02

Combine the elements to form neutral compounds

To form neutral chemical compounds, the charges of the elements must balance each other out. We will combine the elements in such a way that their total positive charge equals their total negative charge. (a) Barium and Selenium: Ba^2+ with Se^2-, the charges are equal, and only one ion of each element is needed. Chemical formula: BaSe (b) Lithium and Selenium: Li^1+ needs 2 Li ions to balance the 2- charge from Se. Chemical formula: Li2Se (c) Aluminum and Selenium: Al^3+ needs 2 Al ions to have a total charge of 6+. Two Se^2- ions have a total charge of 4-. So, 3 Se^2- and 2 Al^3+ would balance the charges. Chemical formula: Al2Se3
03

Final Results: Chemical Formulas

The chemical formulas for the compounds formed between selenium and the other elements are as follows: (a) Barium: BaSe (b) Lithium: Li2Se (c) Aluminum: Al2Se3

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