The Periodic Law Periodic Table of Elements video.
-
Upload
timothy-leblanc -
Category
Documents
-
view
229 -
download
1
Transcript of The Periodic Law Periodic Table of Elements video.
The Periodic Law
Periodic Table of Elements
video
Development of the Periodic Table
Dmitri Mendeleev developed the first periodic table
The periodic table is an arrangement of elements according to their chemical and physical properties
Mendeleev’s Periodic Table
Mendeleev arranged the elements according to their atomic masses
The elements followed a pattern of 1 2 3 4 3 2 1 (valence electrons)
video
Questions
Who developed the first periodic table?
What is the periodic table?What are valence electrons?How did Mendeleev arrange
elements in the first periodic table?
Periodic
Refers to repeating according to a pattern
Questions
Why are the days of the week and the months of the year periodic?
Modern Periodic Tablevideo
Henry Moseley determined the atomic number of the elements
Elements in the modern periodic table are arranged according to atomic numbers
video
Periodic Law
States that the physical and chemical properties of elements are periodic functions of their atomic numbers
Properties of elements have some pattern according to their atomic numbers
Questions
What is the major difference between Mendeleev’s periodic table and the modern periodic table?
Columns in the periodic table
Columns of elements are known as groups or families
Elements in a family have similar properties
Rows in the periodic table
The horizontal rows of elements are called periods
The elements in a period do NOT have similar properties
Periods
First element in a period is an active solid
Last element in a period is an inactive gas
Questions
What is the major difference between periods and families?
How are elements in a family similar?
How are elements in a period different?
Element squares in the periodic table
The basic information found in each square of the periodic table :
Atomic number Chemical symbol Element name Atomic mass video
Elements
Elements are classified as:
Metals NonmetalsMetalloids
Questions
What information is found in the squares on the periodic table?
How can an element be classified?
Characteristics of Metals (video)
Good conductors of heat and electricity
Shiny; High melting pointsMalleable (bends easily) Ductile (can be made into
wires)Found on the LEFT of the
periodic table
Questions
What is the difference between ductile and malleable?
Where are metals found on the periodic table?
Properties of Nonmetals
DullBrittle (hard/ easily broken)Found on the RIGHT of the
periodic tablevideo
Properties of Metalloids
Has properties of both metals and nonmetals
Found touching the dark, zig-zag line
Metalloid means “metal-like”video
Questions
What is a metalloid?Where are metalloids located
in the periodic table?Where are nonmetals
located on the periodic table?
Periodic Properties of Elements (Modern Table)
Valence pattern across a period is 1 2 3 4 3 2 1 0 (left to right)
Metals lose electrons easilyNonmetals gain electrons easily
Periodic Properties of Elements
The size of the atom decreases from left to right across a period
The metallic properties of elements decrease from left to right across a period
Elements on the left are more reactive than the elements on the right
Questions
What happens to metallic properties as one moves from left to right across a period?
What is the valence pattern of electrons across a period?
video