6. \( \_ \)Ca \( +\ldots \mathrm{HoF}_{3} \rightarrow \ldots \mathrm{Ho}+\ldots \mathrm{CaF}_{2} \)
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Calcium (Ca) is known for its affinity to create ionic compounds, especially when reacting with halogens. In the case of holmium trifluoride (HoF₃), calcium would displace holmium to form calcium fluoride (CaF₂) along with elemental holmium. This reaction is a great illustration of a single replacement reaction (also known as a single displacement reaction), where a more reactive metal replaces a less reactive one in a compound. When conducting this reaction in a lab setting, it's important to ensure proper safety measures as handling metal powders and reactive halides can pose hazards. It's also wise to avoid moisture during the preparation, as water can lead to unwanted side reactions that might yield different products than intended.