MgCl2 crystals are composed of
A) units of MgCl2 molecules held together by dipole interactions.
B) groups of Mg2+ ions and Cl2 molecules.
C) units composed of six Mg atoms and six Cl2 molecules.
D) a multitude of Mg2+ ions and Cl- ions grouped together in a three-dimensional array with a 1:2 ratio of Mg2+ to Cl-.
E) a two-dimensional array of [-Mg-Cl-Cl-] units.
D
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