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) aluminum.

Name: Chemistry: The Central Science
Author: Brown
ISBN: 9780134414232

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Step 1: Identify the charge of selenium. Selenium typically forms a 2- charge as an anion (Se^{2-}).

Step 2: Determine the charge of barium. Barium is an alkaline earth metal and typically forms a 2+ charge as a cation (Ba^{2+}).

Step 3: Write the chemical formula for the compound formed between selenium and barium. Since both ions have charges of equal magnitude but opposite signs, they will combine in a 1:1 ratio to form BaSe.

Step 4: Determine the charge of aluminum. Aluminum is a group 13 element and typically forms a 3+ charge as a cation (Al^{3+}).

Step 5: Write the chemical formula for the compound formed between selenium and aluminum. To balance the charges, two Al^{3+} ions will combine with three Se^{2-} ions, resulting in the formula Al_2Se_3.

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Ionic Compounds

Ionic compounds are formed when atoms transfer electrons, resulting in the formation of charged ions. Typically, a metal donates electrons to become a positively charged cation, while a non-metal accepts electrons to become a negatively charged anion. In this case, barium (Ba) will form a Ba²⁺ cation, and selenium (Se) will form a Se²⁻ anion, leading to the compound BaSe.

Charge Balance

In ionic compounds, the total positive charge must balance the total negative charge to achieve electrical neutrality. For barium and selenium, the Ba²⁺ cation has a +2 charge, which perfectly balances the -2 charge of the Se²⁻ anion. However, aluminum (Al) typically forms a +3 cation (Al³⁺), requiring two selenium anions to balance the charge, resulting in the formula Al2Se3.

Chemical Formulas

Chemical formulas represent the composition of a compound, indicating the types and numbers of atoms involved. The subscripts in a formula denote the ratio of each element in the compound. For the compounds formed with selenium, BaSe indicates a 1:1 ratio of barium to selenium, while Al2Se3 indicates a 2:3 ratio of aluminum to selenium, reflecting the charge balance needed for neutrality.