Final answer:
The smallest whole-number ratio of Mg²+ to Cl¯ ions in MgCl₂ is 1:2. In a mini-crystal model, there is 1 Mg²+ ion and 2 Cl¯ ions.
Step-by-step explanation:
The smallest whole-number ratio of magnesium ions to chloride ions in MgCl₂ is 1:2, which means that for every one Mg²+ ion, there are two Cl¯ ions. Therefore, the answer to the first question is c) 1:2.
In a mini-crystal model of MgCl₂, there are 1 Mg²+ ion and 2 Cl¯ ions. Therefore, the answer to the second question is b) 2, and the answer to the third question is c) 3.
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