Chem 1411
Practice problem of chap8
1. Which of the following atoms has the electron configuration as [Ar] 4s23d7?
(a) Sc
(b) V
(c) Fe
(d) Co
(e) Zn
2. *Which of the following electron configurations do represent similar chemical properties of
their atoms?
(i) 1s22s22p63s2
(ii) 1s22s22p3
(iii) 1s22s22p63s23p64s23d104p5
(iv) 1s22s1
(v) 1s22s22p6
(vi) 1s22s22p63s23p3
(a) (i), (v)
(b) (ii), (vi)
(c) (iii), (vi)
(d) (i), (iii)
(e) (ii), (iii)
3. *A metal ion with a net +3 charge has five electrons in the 3d subshell. What is this metal?
(a) Cr
(b) Mn
(c) Fe
(d) Co
(e) Ni
4. What is the ion with +3 charges that has the electron configuration as [Ar]3d3?
(a) Sc3+
(b) Cr3+
(c) Co3+
(d) Rh3+
(e) Ir3+
5. Which of the following pairs are not isoelectronic?
(a) K+ and Cl(b) Ca2+ and S2- (c) Al3+ and N3- (d) P3- and Sc3+ (e) Rh3+ and Ir3+
6. *Which of the following is a correct order of atomic radii?
(a) Ar < P < Na < Ca < Cs
(b) Cs < Rb < K < Na < Li
(c) Na < Mg < Al < Si < P
(d) Rb < Mg < C < F < He
(e) Li < H < Al < K < Ar
7. *Which of the following is a correct order of ionic radii?
(a) Na+ < Mg2+ < Al3+ < O2- < F- < N3(b) Al3+ < Mg2+ < Na+ < F- < O2- < N3(c) F- < O2- < N3- < Na+ < Mg2+ < Al3+
(d) Al3+ < Mg2+ < Na+ < N3- < O2- < F-
(e) Na+ < Mg2+ < Al3+ < O2- < N3- < F8.
(a)
(b)
(c)
(d)
(e)
Which of the following statements is correct?
For the first ionization energy: K < Ca < P < F < Na
For electron affinity: F < Na < O < Al < Mg
MgO is an acidic oxide.
P4O10 is a basic oxide.
Al2O3 is an amphoteric oxide.
9. Specify the group of the periodic table in which each of the following elements is found (A)
[Ne]3s1, (B) [Ne]3s23p3, (C) [Ne]3s23p6, (D)[Ar]4s23d8,
(a) Group 1A, 5A, 8A, 8B (b) Group 1A, 3A, 8A, 8B
(c) Group 2A, 5A, 5A, 8B
(d) Group 1A, 5A, 5A, 10B
(e) Group 1A, 3A, 6A, 8B
10. *Arrange the following in order of the increasing first ionization energy: Na, Cl, Al, S, Cs
(a) Na< Cs < Al < S < Cl
(b) Cs < Na< S < Al < Cl
(c) Cs < Na < Al < S < Cl
(d) < Al Cs < Na < S < Cl
(e) Cs < Na < Cl < Al < S
11. *Which of the following statement is correct concerning the change of chemical properties of
oxides across the period or within a group?
(a) From left to right across a period, oxides change from basic to amphoteric to acidic. Going
down a group, the oxides become more basic.
(b) From left to right across a period, oxides change from acidic to amphoteric to basic. Going
down a group, the oxides become more basic.
(c) From left to right across a period, oxides change from basic to amphoteric to acidic. Going
down a group, the oxides become more acidic.
(d) From left to right across a period, all the oxides are acidic. Going down a group, the oxides
become more basic.
(e) From left to right across a period, all the oxides are basic. Going down a group, the oxides
become more basic.