chapter 5 (cont.) the periodic table. history of the periodic table mendeleev (1860’s)...
TRANSCRIPT
Chapter 5 (cont.)
The Periodic
Table
History of the Periodic Table
• Mendeleev (1860’s)– Developed the first periodic table– It was arranged by atomic mass– He was able to predict properties of elements
History of the Periodic Table (cont.)• Moseley – developed the modern periodic
table
• His periodic table was
arranged based on atomic
number
The Periodic Table
Characteristics of Metals
• Hard
• Shiny
• Conduct heat and electricity well
• Includes the transition and inner-transition metals– Inner transition metals include the lanthanide
and actinide series
Characteristics of Nonmetals
• Are gases or brittle solids at room temp.
• Surfaces are dull
• Insulators
Characteristics of Metalloids
• Have properties of both metals and nonmetals
Period vs. Group• Period
– All elements in a horizontal row– 7 periods on the periodic table– Arranged in increasing atomic number
• Group– All elements in a vertical column– Sometimes called “families”– Have similar properties
Group 1 (IA) – Alkali Metals
Group 2 (IIA) – Alkaline Earth Metals
Group 17 (VIIA) - Halogens
Group 18 (VIIIA) – Noble Gases
Left of stair step
On the stair step
Right of stair step
METALS
NONMETALS
Metals- Nonmetals
-Metalloids-
B. Organization of the Periodic Table
METALLOIDS
TRANSITION “Group B”
INNER TRANSITION
REPRESENTATIVE
“Group A”
Group A- RepresentativeGroup B - Transition
B. Organization of the Periodic Table
The Extended Periodic Table