Answer to Question #164087 in General Chemistry for Ron

Question

1. Does a cation gain protons to form a positive charge or does it lose electrons?

2. Iron(III) sulfate [Fe2(SO4)3] is composed of Fe3+ and SO2−4SO42− ions. Explain why a 

sample of iron(III) sulfate is uncharged.

3. Which of the following atoms would be expected to form negative ions in binary ionic 

compounds and which would be expected to form positive ions: P, I, Mg, Cl, In, Cs, O, Pb, 

Co?

4. Which of the following atoms would be expected to form negative ions in binary ionic 

compounds and which would be expected to form positive ions: Br, Ca, Na, N, F, Al, Sn, S, 

Cd?

5. Predict the charge on the monatomic ions formed from the following atoms in binary ionic 

compounds:

a. P

b. Mg

c. Al

d. O

e. Cl

f. Cs

6. Predict the charge on the monatomic ions formed from the following atoms in binary ionic 

compounds:

a. I

b. Sr

c. K

d. N

e. S

f. In

7. Write the electron configuration for each of the following ions:

a. As3–

b. I

–

c. Be2+

d. Cd2+

e. O

2–

f. Ga3+

g. Li+

h. N

3–

i. Sn2+

j. Co2+

k. Fe2+

l. As3+

8. Write the electron configuration for the monatomic ions formed from the following 

elements (which form the greatest concentration of monatomic ions in seawater):

a. Cl

b. Na

c. Mg

d. Ca

e. K

f. Br

g. Sr

h. F

9. Write out the full electron configuration for each of the following atoms and for the 

monatomic ion found in binary ionic compounds containing the element:

a. Al

b. Br

c. Sr

d. Li

e. As

f. S

10. From its position in the periodic table, determine which atom in each pair is more 

electronegative:

a. Br or Cl

b. N or O

c. S or O

d. P or S

e. Si or N

f. Ba or P

g. N or K

11. From their positions in the periodic table, arrange the atoms in each of the following series 

in order of increasing electronegativity:

a. C, F, H, N, O

b. Br, Cl, F, H, I

c. F, H, O, P, S

d. Al, H, Na, O, P

e. Ba, H, N, O, As

12. Identify the more polar bond in each of the following pairs of bonds:

a. HF or HCl

b. NO or CO

c. SH or OH

d. PCl or SCl

e. CH or NH

f. SO or PO

g. CN or NN

13. Write the Lewis symbols for each of the following ions:

a. As3–

b. I

–

c. Be2+

d. O

2–

e. Ga3+

f. Li+

g. N3-

14. Many monatomic ions are found in seawater, including the ions formed from the following 

list of elements. Write the Lewis symbols for the monatomic ions formed from the 

following elements:

a. Cl

b. Na

c. Mg

d. Ca

e. K

f. Br

g. Sr

h. F

15. Write the Lewis symbols of the ions in each of the following ionic compounds and the 

Lewis symbols of the atom from which they are formed:

a. MgS

b. Al2O3

c. GaCl3

d. K2O

e. Li3N

f. KF

16. Write Lewis structures for the following:

a. ClF3

b. PCl5

c. BF3

d. PF−6

e. SeF6

f. XeF4

g. SeCl+3SeCl3+

h. Cl2BBCl2 (contains a B–B bond)

17. Identify the atoms that correspond to each of the following electron configurations. Then, 

write the Lewis symbol for the common ion formed from each atom:

a. 1s

2

2s

2

2p

5

b. 1s

2

2s

2

2p

6

3s

2

c. 1s

2

2s

2

2p

6

3s

2

3p

6

4s

2

3d

10

d. 1s

2

2s

2

2p

6

3s

2

3p

6

4s

2

3d

104p

4

e. 1s

2

2s

2

2p

6

3s

2

3p

6

4s

2

3d

104p

1

Answer 1

1. lose electrons

2. because there is equal distribution of electrons8

3. Negative (I, Cl, O), Positive (P, Mg, In, Cs, Pb, Co)

4. Negative (Br, F), Positive (Ca, Na, N, Al, Sn, S, Cd)

5. a. P = 3+

b. Mg = 2+

c. Al = 3+

d. O = 2-

e. Cl = -1

f. Cs ,z= +