Assignment 4 - solution.docx - Assignment 4[1 The ions Na...

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Assignment 4 [1] The ions Na + and Mg 2+ occur in chemical compounds, but the ions Na 2+ and Mg 3+ do not. Explain. [2 marks] Sodium (Na) is located at group 1. It consists 1 valence electron hence it need to donate 1 electron to achieve octet electron arrangement and form N + ¿ a ¿ ( cation ion). However, Na 2+ cannot form. It cannot donate 2 valence electrons to achieve octet electron arrangement as Na 2+ will not stable. Magnesium(Mg) is located at group 2. It consists 2 valence electrons hence it need 2 electrons to achieve octet electron arrangement and form Mg 2+ (cation ion). However, Mg 3+ cannot form. It cannot donate 3 valence electrons to achieve octet electron arrangement as Mg 3+ will not stable. [2] Distinguish between an acidic and a basic oxide. Give examples of each. [2 marks] Acidic oxide Basic oxide mostly oxides of non-metals, and they dissolve in water to form acids. Mostly oxides of metals and they combine with water to form bases The example of Acidic oxide: manganese(VII) oxide The example of basic oxide: Copper (II) oxide [3] Write an equation for the reaction of potassium metal with water. [2 marks]
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