Discussion
In a Germanium crystal containing N atoms, the total number of outer electrons in the crystal is
Answer: E
The total number of outer electrons is 4 N.
Germanium is in group 14 and has four valence electrons ([Ar]3d104s24p2). In the crystal each atom shares these four electrons in covalent bonds with four neighbours, so N atoms contribute 4N outer electrons.
The other multiples correspond to elements with 1, 2, 3 or 6 valence electrons.
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