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Section Name Experiment 6 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,CI2. For counting purposes with Lewis structures, 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. Cl is in Group N is in Group His in Group In NH,CI re is a total of valence electrons. 2. The model consists of balls and sticks. How many holes should be in the ball you select for the N atom? the H atoms the Cl atom? The electrons in the molecule are paired, and each stick represents a valence electron pai 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 Natoms three bonds, whereas cl and H atoms usually form only one. Draw a sketch of form the skeleton below:
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Answer #1

Question 1.

NH2Cl2

N = 5; H = 1, Cl = 7

N is bionded to 2 H, and Cl, so there are 2 electrons left

H = bonded to N, no elecetnos left

Chlorine isbonded to nitrgoen, 6 electron left

so

2+0+6 = 8 valence electrons in NH2Cl2 free, therefore, 4 lone pairs free

N = group 5

H = group 1

Cl = group 7

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