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

BlackTom题目解析

Question

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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