本题目来源于试卷: Models of Bonding & Structure B.1 The Ionic Model，类别为 IB化学
[单选题]
Which of the following statements correctly describes what happens when magnesium fluoride is formed?
A. One magnesium atom gains two electrons to achieve a full outer shell of electrons
B. For every magnesium ion formed, two fluorine atoms each gain one electron to form two fluoride ions, each with a single negative charge
C. Two fluorine atoms each gain one electron, to form a fluorine molecule where each atom has a full outer shell
D. Electrons are transferred from the fluorine atoms to the magnesium atoms
参考答案: B
本题详细解析:
Magnesium has two electrons in its outermost shell and loses both to achieve a full outer shell (M$g^{2+}$). Fluorine has seven electrons in its outermost shell; it needs one more electron to achieve a full outer shell ($F^{1-}$) Two fluorine atoms are therefore required for each magnesium atom in order to form a neutral ionic compound (where the charges of the positive and negative ions cancel out).
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