CHAPETR 8 PRACTICE TEST: Trends and electron configuration
1. The elements in which of the following have most nearly the same atomic radius?
(A) Be, B, C, N
(B) Ne, Ar, Kr, Xe
(C) Mg, Ca, Sr, Ba
(D) C, P, Se, I
(E) Cr, Mn, Fe, Co
2. Which of the following represents the ground state electron configuration for the Mn3+ ion? (Atomic
number Mn = 25)
(A) 1s2 2s22p6 3s23p63d4
(B) 1s2 2s22p6 3s23p63d5 4s2
(C) 1s2 2s22p6 3s23p63d2 4s2
(D) 1s2 2s22p6 3s23p63d8 4s2
(E) 1s2 2s22p6 3s23p63d3 4s1
3. Ca, V, Co, Zn, As
Gaseous atoms of which of the elements above are paramagnetic (have unpaired electrons)?
(A) Ca and As only
(B) Zn and As only
(C) Ca, V, and Co only
(D) V, Co, and As only
(E) V, Co, and Zn only
Use these answers for questions 4-6.
(A) O (B) La (C) Rb (D) Mg (E) N
4. What is the most electronegative element of the above?
5. Which element exhibits the greatest number of different oxidation states?
6. Which of the elements above has the smallest ionic radius for its most commonly found ion?
7. All of the following statements concerning the characteristics of the halogens are true EXCEPT:
(A) The first ionization energies (potentials) decrease as the atomic numbers of the
halogens increase.
(B) Fluorine is the best oxidizing agent (easy to reduce).
(C) Fluorine atoms have the smallest radii.
(D) Iodine liberates free bromine from a solution of bromide ion.
(E) Fluorine is the most electronegative of the halogens.
8. In the periodic table, as the atomic number increases from 11 to 17, what happens to the
atomic radius?
(A) It remains constant.
(B) It increases only.
(C) It increases, then decreases.
(D) It decreases only.
(E) It decreases, then increases.
9. The ionization energies (kJ/mol) for element X are:
I1 = 580, I2 = 1815, I3 = 2740, I4 = 11600, I5 = 14800.
On the basis of the data, element X is most likely to be
(A) Na (B) Mg (C) AI (D) Si (E) P
10. Which of the following is the smallest?
A. Na
B. Cl
C. Fe
D. P
E. Br
11. Which is the largest?
A. O
B. F
D. P
E. B
C. Al
12. The first ionization energies for the elements _____ as you go across a period and ____ as
you go down a group.
A. increase, increase
B. increase, decrease
C. decrease, increase
D. decrease, decrease
E. cannot predict the trend
13. Of the following elements, which has the largest first ionization energy?
A. K
B. Rb
C. Sr
D. Ca
E. Ba
14. Which of the following correctly represents the second ionization energy of phosphorous?
A. P+ (g) + e- → P2+ (g)
B. P (g) → P+ (g) + eC. P- (g) + e- → P2- (g)
D. P+ (g) → P2+ (g) + eE. P+ (g) + e- → P (g)
ANSWERS
1. E
2. A
3. D
4. A
5. B
6. D
7. D
8. D
9. C
10. B
11. C
12. B
13. D
14. D