Fluorine forms both ionic and covalent compounds. Magnesium reacts with fluorine to form the ionic compound magnesium fluoride. The electronic structures of an atom of magnesium and an atom of fluorine are shown. Complete the dot-and-cross diagrams to show the electronic structures of one magnesium ion and one fluoride ion. Show the charges on the ions.
Exam No：0620_s20_qp_42 Year：2020 Question No：2(a)(i)
Answer:
magnesium \(2.8\) (all crosses) (1)
fluorine \(2.8\) (seven dots and one cross in outer shell) (1)
\(\mathrm{Mg}^{2+}\) and \(\mathrm{F}^{-}(1)\)
fluorine \(2.8\) (seven dots and one cross in outer shell) (1)
\(\mathrm{Mg}^{2+}\) and \(\mathrm{F}^{-}(1)\)
Knowledge points:
2.4.6. Describe the formation of ionic bonds between ions of metallic and non-metallic elements, including the use of dot-and-cross diagrams
Solution:
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