How many bromide ions can combine with one ion of aluminum to form an ionic compound?

BlackTom题目解析

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How many bromide ions can combine with one ion of aluminum to form an ionic compound?

BlackTom题目解析

BlackTom AI · Accepted Answer

First, consider the charges of the ions involved. Aluminum typically forms Al3+ ions, while bromide is Br−. To make a neutral ionic compound, the total positive charge must balance the total negative charge.
Option 1: 3. If one Al3+ combines with three Br−, the total charges are +3 and −3, which balance to form AlBr3. This is the correct balancing ratio.
Option 2: 6. Pairing Al3+ with six Br− would give +3 and −6, resulting in a net −3 charge for the compound, which is not neutral and thus not feasible as a simple ionic compound in this context.
Option 3: 1. One Br− would yield +3 and −1, leaving a net +2 charge unbalanced, so a neutral compound cannot be formed with this ratio.
Option 4: 2. Two Br− give +3 and −2, leaving a net +1 charge unbalanced, again not forming a neutral compound.

Therefore, the only ratio that neutralizes the charges and produces a stable ionic compound is three bromide ions per aluminum ion, corresponding to AlBr3.

How many bromide ions can combine with one ion of aluminum to form an ionic compound? BlackTom题目解析

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