-What perecentage of a SC unit cell is empty space? Note: Remember the calculati

Question

-What perecentage of a SC unit cell is empty space?

Note: Remember the calculation of atomic packing factor

-where could you fit another atom into SC unit cell?Explain

-Will this atom be the same size as the other atoms, smaller than the other atoms, or larger than the other atoms?why?

-How many of these extra atoms can you fit in the unit cell?Explain

-How many of the original SC atoms are surrounding the extra atom? Explain

-Based on the size of the atoms, if this were an ionic compound, which atoms would be the anions; the original atoms that make up the SC unit cell , or the atom you added? Explain your answer.

-Sodium chloride is a FCC crystal structure with one of the types of atoms in the spaces between the other atoms. which type of atoms ( sodium or chlorine ) are the original atoms that define the FCC lattice?why?

Explanation / Answer

BASIC IdeA

volume cell - volume of atoms = empty space

volume of atoms =
a simple unit cell has 8 corners. 1 atom in each corner. Each corner atom exists in 8 adjacent cells so only 1/8 of each corner atom is any any given unit cell.

total atoms per cell = 1/8 atom per corner x 8 corners = 1 atom / cell

and each atom as volume = 4/3 pi x r

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