Chemical Periodicity
References:
 CK-12.org – Periodic Table
 Crash Course Chemistry – The Periodic Table
This unit begins by reviewing concepts covered in grades nine and ten science.
1.
List the properties of:
a. metals
good conductor of heat and electricity，malleable，ductile，luster
b. nonmetals poor conductor of heat and electricity
c. metalloids or semimetals intermediate between those of metals and nonmetals
2. Who is Dmitri Mendeleev, and what was his contribution to chemistry?
Russian chemist and teacher ，he published a periodic table of the elements.
3. How is the modern periodic table different from the first periodic table?
Many new elements have been discovered, while others have been artificially synthesized.
4. What is the modern periodic law?
arranged in order of increasing atomic number rather than increasing atomic mass
5. Organization of the periodic table. Indicate where the following are located on the periodic table.
a. periods seven horizontal rows
h. Transition Metals the metal on 3-12 group
b. groups eighteen perpendicular line
i. Inner Transition Metals include Lanthanide and Actinide matel
c. Alkali metals 2 to 7 period on first group
k. Lanthanides number57-71
d. Alkaline Earth Metals second group
l. Actinides number89-103
e. Halogens 2 to 7 period in 17 group
m. metals
f. Noble Gases 1 to 7 period on last group
n. nonmetals
g. Representative or Main Group elements
o. metalloids
6. Indicate which elements on the periodic table are:
a. gases at room temperature. H, He, N, O, F, Ne, CL, Ar, Kr, Xe, Rn
b. liquids at room temperature. Br, Hg
7. Trends in the periodic table.
a. How does the size of the atom vary as you move left to right across the periodic table? Why? smaller
b. How does the size of the atom vary as you move down the periodic table? Why? bigger,
c. What is ionization energy? Ionization energy is the energy required to remove an electron from a gaseous atom or ion.
d. How does the ionization energy vary as you move left to right across the periodic table? Why? bigger
e. How does the ionization energy vary as you move down the periodic table? Why? smaller
f. What is electron affinity? the amount of energy released or spent when an electron is added to a neutral atom or molecule in the gaseous
g. How does electron affinity state
varytoas
you
move ion.
left to right across the periodic table? Why? bigger
form
a negative
h. How does electron affinity vary as you move down the periodic table? Why?
smaller
i. What is electronegativity? a measure of the tendency of an atom to attract a bonding pair of electrons.
j. How does electronegativity vary as you move left to right across the periodic table? bigger
k. How does electronegativity vary as you move down the periodic table? smaller
L. Farrell – Chemistry 11 Advanced – Chemical Periodicity