In the reaction given, \( \text{BeF}_2 + \text{Mg} \rightarrow \text{MgF}_2 + \), you are looking for the product along with the type of reaction.
The reaction represents a single displacement reaction (also known as a single replacement reaction) where magnesium is displacing beryllium from beryllium fluoride.
The complete equation would be: \[ \text{BeF}_2 + \text{Mg} \rightarrow \text{MgF}_2 + \text{Be} \]
Thus, the missing product is Be (beryllium).
So, the final balanced reaction is: \[ \text{BeF}_2 + \text{Mg} \rightarrow \text{MgF}_2 + \text{Be} \]
It's a single displacement reaction where magnesium replaces beryllium in the compound.
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