This diagram is part of the ionic arrangement in sodium oxide, a compound used in making some glass and ceramic glazes. A manufacturer compares sodium oxide...
Question 1 Report
This diagram is part of the ionic arrangement in sodium oxide, a compound used in making some glass and ceramic glazes. A manufacturer compares sodium oxide with magnesium oxide because both compounds contain oxide ions. The diagram is not drawn to scale, but it shows the ratio of the ions in sodium oxide.
(a) State the charge on an oxide ion. [3]
(b) Complete the formula of sodium oxide. [3]
(c) Give the formula of magnesium oxide. [3]
(d) Name the type of bonding in both compounds. [3]
(e) Explain why sodium oxide has a regular arrangement of ions rather than separate molecules. [4]
Answer Details
(a) An oxide ion has charge 2−, written O2-. [3]
(b) Two Na+ ions balance one O2- ion, so sodium oxide is Na2O. [3]
(c) Mg2+ and O2- balance in a 1:1 ratio, so magnesium oxide is MgO. [3]
(d) Both compounds have ionic bonding. [3]
(e) Sodium atoms transfer electrons to oxygen atoms. This forms positive sodium ions and negative oxide ions. Oppositely charged ions attract, and this attraction acts in all directions, producing a giant regular ionic lattice rather than separate molecules. [4]
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