Chapter 9 Basic Homework

1. Match the following with the kind of bond which is makes

Answer :     FI -- Polar Covalent because one of the atom is negative and other one is Positive

                    CsI -- Ionic Bonding  -- One or more electron transferred between atoms
                    H2 -- Purely Covalent -- 2 electron equally shared between atoms.

2. What is the difference in electronegativity between the atom in HI?
Answer:    0.4 -- refer the table above I(2.5) - H(2.1) = 0.4

3. Which of the atoms in HI has a partial positive charge? Namely, when HI is placed in the electric field between two charged plates, which atom would point towards the negative plate? Write either H or I
Answer: H -- H+ and I- 

4.  How many valence electron does Boron have? 

Answer:  3 

How:  As you can see 13 above B means 3 valence electron, 14 above Carbon means 4 valence electron and so forth 5 for nitrogen, 6 for Oxygen, & for Fluorine, 8 for Neon.

5. How many valence electron does magnesium have ?

Answer: 2 -- same logic as above.

6. How many valence electron does bromine have ?

Answer:  7

7. How many valence electron does argon have ?

Answer: 8

8. Which letter (a, b, c, d, e, f, g, or h) shows correct lewis structure for O?

Answer: F, because Oxygen have 6 valence electron.

9. Which letter shows correct lewis structure for S?

Answer:  Same as Oxygen it falls under same column. F

10. Which letter shows correct lewis structure for Kr?

Answer: H

11. Which letter shows correct lewis structure for Ga?

Answer: C

12. Which of the following statement about Lewis Structure is FALSE?

Answer: 

a. The noble gases have 8 valence electrons, except He which has 2.

b. For the noble gases these are placed in 4 pairs. Each pair represents an electron orbital with two electrons.

c. The octet rule states that elements like to have 8 valence eletrons in order to have the stable noble gas electron configuration. Note, however, that H likes to have 2 valence electrons to be like He.

d. To have the stable noble gas electron configuration, N generally makes 3 bonds.

e. To have the stable noble gas electron configuration, C generally makes 4 bonds.

f. To have the stable noble gas electron configuration, C generally makes 5 bonds. 

13.  Write the Lewis Structure H₂O for and check those statement which are correct.

a. O is the central atom. 

b. One of the H is the central atom.

c. There are 6 valence electrons.

d. There are 8 valence electrons. 

e. There are 10 valence electrons.

f. O has 0 lone pair of electrons.

g. O has 1 lone pair of electrons.

h. O has 2 lone pairs of electrons.