Fig. 1 shows a dot-and-cross diagram made by a student for magnesium oxide, used as a lining material in a small furnace. Mg²⁺[2,8]O²⁻[2,8] •×•×+© EAGLE BEA...
Question 1 Report
Fig. 1 shows a dot-and-cross diagram made by a student for magnesium oxide, used as a lining material in a small furnace.
(a) Complete the formula of magnesium oxide: Mg___ [1]
(b) What type of chemical bond joins the magnesium and oxygen atoms? [1]
(c) Use the diagram to give the number of electrons transferred from each magnesium atom. [1]
(d) Suggest why solid magnesium oxide does not conduct electricity. [1]
Answer Details
Magnesium oxide forms when magnesium transfers two electrons to oxygen, producing oppositely charged ions.
- (a) The formula is MgO. The charges \(\mathrm{Mg^{2+}}\) and \(\mathrm{O^{2-}}\) balance in a 1:1 ratio. [1]
- (b) The bond is ionic. [1]
- (c) Each magnesium atom transfers 2 electrons. [1]
- (d) Solid magnesium oxide does not conduct because its ions are fixed in the lattice, so there are no mobile charged particles to carry charge. [1]
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