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Topic 4: Chemical bonding

31. Lewis electron-dot diagrams. Recognizing Lewis electron-dot in bonds and molecules

1. In the Lewis electron-dot diagram , the dots represents
1) Valance electrons of H atom only 3) Valance electron for both H and C atom
2) Valance electrons of Cl atom only 4) All the electrons found in H and C atoms
2. Which electron-dot formula represents ionic bonding between two atoms?

1) 2) 3) 4)
3. Which Lewis electron-dot diagram represents a compound that contains both ionic and covalent bonds?

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. . 2-
: O :
. .
1) Ca : O : S : O : . . . . . . . .
+
2+

3) H : S :

2) K [ : Br : ] -
4) : Br : Br :
. . . . . . . . . .

H

: O :
. .

. .
4. Which electron-dot symbol represents a nonpolar molecule?

1) 2) 3) 4)
5. Which is a Lewis electron-dot for a polar substance?
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1) 2) 3) 4)

32. Lewis electron-dot symbols: Determining correct dot symbols

1. Which Lewis electron – dot diagram is correct for a hydrogen molecule?
1) 2) 3) 4)

2. A diatomic chlorine molecule is correctly shown in which Lewis electron-dot diagram?

1) 2) 3) 4)
3. Which is the correct electron-dot structure for hydrogen chloride?

1) 2) 3) 4)
4. Carbon dioxide is correctly represented by which Lewis electron-dot diagram?
. . . . . . . .
2) : O : : C : : O :

4) : O : : C : : O :
1) : O : : C : : O :
3) O : : C : : O
. . . . . . . .

5. Which electron-dot is correct for barium fluoride ?
. . . . . . . .
-
-
2+
-
2+
2+
2+
3) Ba 2 :F 4) : Ba : 2 : F :
1) Ba 2 : F :
. . . . . . . . -
2) : Ba : 2 F

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