Chem 1411 - Chapter 7B
ATOMIC STRUCTURE & PERIODICITY
1.
Identify the following elements as metals, non metals, metalloids , Noble gases, Lanthanides
and Actnides
Na, N, Rb, Sc, Ar, Si, Nd, Ce, Cl, Hg, Th, Rn, Bi
2. An atom of a certain element has 16 electrons. Find the following
a) Electron configuration b) Core configuration
c) Group and period
d) Paramagnetic or diamagnetic
3. Arrange the following atoms in the increasing order of atomic radius.
Mg, O, Al, Ne, Li, Ca
4. From each one of the following pairs, indicate which one is larger.
a) Ca2+ and Mg2+ b) N3- and O2- c) Hg+ and Hg2+ d ) F- and Br-
5. Which atom should have a smaller first ionization energy?
a) Ca, Mg
b) Na, Al
c) N and O
e) Na+ and S2-
d) F and Ne
6. Which atom should have a higher first ionization energy?
a) Li and Be
b) Mg and Ba
c) F and Cl
d) S and Ar
7. Select the ions or atoms from the following sets that are iso electronic with each other.
a) S2- , Se2-, Ar
b) Cl-, Cl, Ar
c) Ca2+, Cl-, S2-, K+
d) H-, Li+, He
8. Using only periodic table, select the most electronegative atom in each of the following
sets: a) As, Si, Ge, Ga
b) Li, Be, B, Al
c) Cl, F, I, Br
9. Arrange the halogens in the increasing order of electron affinities. Explain your answer.
10. How do the properties of Oxides change from left to right in a period and top to bottom in a
group.
11. Identify the following oxides as acidic, basic and amphoteric
a) SO3
b) SiO2
c) Na2O
d) As2O3
e) Al2O3
f) CuO
g) ZnO
h) NO2