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
developed the first periodic table? What is the periodic table? What are valence electrons? How did Mendeleev arrange elements in the first periodic table?
Who
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 Table video 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 Nonmetals Metalloids
Questions
information is found in the squares on the periodic table? How can an element be classified?
What
Characteristics of Metals (video)
Good conductors of heat and
electricity Shiny; High melting points Malleable (bends easily) Ductile (can be made into wires) Found on the LEFT of the periodic table
Questions
is the difference between ductile and malleable? Where are metals found on the periodic table?
What
Properties of Nonmetals
Dull
(hard/ easily broken) Found on the RIGHT of the periodic table video
Brittle
Properties of Metalloids
properties of both metals and nonmetals Found touching the dark, zigzag line Metalloid means “metal-like” video
Has
Questions
is a metalloid? Where are metalloids located in the periodic table? Where are nonmetals located on the periodic table?
What
Periodic Properties of Elements (Modern Table)
pattern across a period is 1 2 3 4 3 2 1 0 (left to right) Metals lose electrons easily Nonmetals gain electrons easily
Valence
Periodic Properties of Elements
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
The
Questions
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
What