Download Lesson 2 Organizing the Elements

Unit: Chemistry
Lesson 2: Organizing the Elements
Essential Questions:
1.) What did Mendeleev discover?
2.) What information does the
periodic table contain?
3.) How is the periodic table useful?
Mendeleev’s Work
Properties of elements he studied:
1. Melting point
2. Density
3. Color
Average mass of all
the isotopes of that
element
Atomic mass
*Reminder*
The sum of the
protons and neutrons
in the atom
Mass number
 He arranged the element cards in
increasing atomic number.
 A pattern of properties appeared.
Textbook page 81
An arrangement of
elements showing the
repeating pattern of
their properties
periodic table
Information in the Periodic Table
Textbook
page 84
A horizontal row
of elements. The
properties change
in a pattern.
period
Elements of Period 3
The properties of the Period 3 elements change as you move across the
period. Which of these are Metal? Metalloid? Nonmetal?
A column of
elements. The
elements have the
same properties.
Elements of Group 10
The elements of Group 10
include nickel (Ni), palladium
(Pd), platinum (Pt), and
darmstadtium (Ds).
group