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Name Section Experiment 13 Advance Study Assignment: The Geometrical Structure of Molecules You are asked by your instructor to construct a model of the NH.CI molecule. Being of a conservative nature, you proceed as directed in the section on Experimental Procedure. 1. First you need to find the number of valence electrons in NH CI. For counting purposes with Lewis struc- tures, the number of valence electrons in an atom of a main group element is equal to the last digit in the group number of that element in the Periodic Table. N?s in Group H is in Group Cl is in Group In NHCI there is a total of valence electrons. 2- The model consists of balls and sticks. a. How many holes should be in the ball you select for the N atom? b. How many holes should be in the ball you select for the H atoms? How many holes should be in the ball you select for the Cl atom? c. The electrons in the molecule are paired, and each stick represents a valence electron pair d. How many sticks do you need 3. Assemble a skeleton structure for the molecule, connecting the balls and sticks to make one unit. Use the rule that N atoms form three bonds, whereas Cl and H atoms usually form only one. Draw a sketch of the skeleton below: 4. How many sticks did you need to make the skeleton structure? a. b. How many sticks are left over? (continued on following page)

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Victor

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1)N is in Group 15 , H is in Group 1 , Cl is in Group 17

In NH2Cl there is a total of 14 valence electrons because Nitrogen - 15 -- 5(last digit)

Chlorine - 17 -- 7(last digit)

Hydrogen - 1 -- 1(last digit) -- total = 5 + 7 + 1(2) = 14.

 

2)

N has 5 valence electrons hence has 5 holes. Each H has 1 hole , Finally the chlorine has 7 holes.

The no. of sticks required is 3 ( 3-bonds are formed).

 

3)Skeleton -

media%2F5e3%2F5e3f63bd-786f-4567-847e-fa

Blue - Nitrogen , White - Hydrogen , Green - Chlorine

 

4) NH2Cl - - -

 

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8 Holes are left over finally.

 

 

5)The geometry of NH2Cl is trigonal pyramid with an unsymmetric charge distribution.

Therefore this molecule is polar.

It cannot have isomers because there are no double or triple bonds.

 

6)Resonance Structures --

 

It doesnot have resonating structure since it does not have a dipole.

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