The ratio of atoms in arrangement B to arrangement A is:
The diameter of a rubidium atom is 4.95 Å. We will consider two different ways of placing the atoms on a surface. In arrangement (a), all the atoms are lined up with one another. Arrangement (b) is called a close-packed arrangement because the atoms sit in the "depressions" formed by the previous row of atoms:
By what factor has the number of atoms on the surface increased in going to arrangement (b) from arrangement (a)?
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