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Magnesium Oxide, MgO, Melts at 2,800^$\circ$C and Is Very Hard

Question 17

Multiple Choice

Magnesium oxide, MgO, melts at 2,800^$\circ$C and is very hard. The liquid conducts electricity very well. What kind of crystal is this

A) Ionic Crystal
B) Covalent Crystal
C) Metallic Crystal
D) Molecular Crystal
E) Amorphous (Not a regular crystal)

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