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Question

For each of the cubic cells (simple cubic, body-centered cubic, and

face-centered cubic) give the coordination number, edge length in terms of r
, and number of atoms per unit cell.
Drag the appropriate items to their respective bin an edge length of 2r


one atom in the unit cell
a coordination number of 12
two atoms in the unit cell
a coordination number of 6
an edge length of 22
-

r


a coordination number of 8
an edge length of 4r/3
-


-

-four atoms in the unit cellan edge length of 2r
Selected

-Simple cubic cell
-Body-centered cubic cell
-Face-centered cubic cell
-question2Niobium has a density of 8.57g/cm
3
 and crystallizes with a body-centered cubic unit cel
Calculate the radius of a niobium atom.


question 3
The density of an unknown metal is 12.3g/cm
3
and its atomic radius is 0.134nm
. It has a face-centered cubic lattice.Find the atomic mass of this metal.


question4
In the following pairs of solids, which one has the higher melting point?

-Match the words in the left column to the appropriate blanks in the sentences on the right. Make certain each sentence is complete before submitting your answer.Fe(s)
-F e ( s )
-KCl(s)
-K C l ( s )
-H
-2
-O(s)
-H Subscript2 O ( s )
-CCl
-4
-(s)
-C C l Subscript4 ( s )
-Ti(s)
-T i ( s )
-Ne(s)
-N e ( s )
-HCl(s)
-H C l ( s )
-H
-2
-S(s)For the pair of compound Ti(s)
- or Ne(s)
- the one with the higher melting point is  
-For the pair of compound T i ( s ) or N e ( s ) the one with the higher melting point is blank.
-.
-For the pair of compound H
-2
-O(s)
- or H
-2
-S(s)
- the one with the higher melting point is  
-For the pair of compound H 2 O ( s ) or H 2 S ( s ) the one with the higher melting point is blank.
-.
-For the pair of compound Fe(s)
- or CCl
-4
-(s)
- the one with the higher melting point is  
-For the pair of compound F e ( s ) or C C l 4 ( s ) the one with the higher melting point is blank.
-.
-For the pair of compound KCl(s)
- or HCl(s)
- the one with the higher melting point is question 5
What are the coordination numbers of Li
+
and S
2−
in the lithium sulfide crystal shown? Enter the values in order of Li
+
and S
2−
, respectively.
Enter two integers separated by commas.What is the density of Li
2
S
in grams per cubic centimeter?
Express your answer to three significant figures and include the appropriate units

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