Name ______ KEY ___________________________________ Date _________ Period ______
Unit 5: The Periodic Table Review
1.
What does it mean to say that a property is periodic? Give an example of a periodic
property.

2.
What is the major change from Mendeleev’s periodic table to the one we currently use?

3.
Mendeleev’s periodic table was organized by atomic mass, while the current
table organized by Moseley is organized by atomic number.
What is an octet? Name and describe the exception to an octet.

4.
A periodic property is a property that sows a trend or repeats when elements
are arranged in order of atomic mass. Examples include atomic radius,
electronegativity, and ionization energy.
An octet is a full valence shell of 8 electrons. Elements with an octet have
stability. The exception is a duet, in which elements fill the first energy level
with 2 electrons for stability.
Horizontal sections of the periodic table are known as rows/periods, while vertical
sections are known as columns/families/groups.
5.
List 3 properties of each class of element below:
Metals:
Solid (except Hg)
Conductive
Lustrous
Malleable/Ductile
6.
Metalloids
Brittle
Semiconductors
Lustrous
Nonmetals:
Gases or brittle solids
Nonconductive
Dull
Not Malleable/Ductile
Define the following terms, describe their periodic trend, and write the symbol of the
element with the highest value of each property:
a. Ionization Energy

Ionization energy is the energy required to remove an electron from an
atom. IE increases from left to right and decreases down a group. He has
the highest IE.
b. Electronegativity

Electronegativity is the ability to attract electrons in a compound. EN
increases from left to right and decreases down a group. F has the highest
EN.
c. Atomic Radius

Atomic radius is the size of one atom of an element. Radius decreases
from left to right and increases down a group. Fr has the highest atomic
radius.