8th Chapt 11 and 12 Flashcards
Use to study! Be realistic about your confidence level with the answers and you will know when you're ready for the test!
The periodic law states…
The repeating chemical and physical properties of elements change periodically with the atomic numbers of the elements
What does periodic mean.
Happening at regular intervals
Properties of metals
Shiny
Conduct electricity
Malleable
Conduct heat
Most elements are…
Metals
Properties of Metalloids
Shiny, but brittle
Can be a conductor of heat and electricity
Properties of nonmetals
- More than 1/2of nonmetals are gases
- Not malleable
- Not shiny
- Poor conductors of electricity and heat
- They are located to the right of the zigzag line on the periodic table
Elements are identified by…
Each element is represented by a square on the periodic table, including the name, chemical symbol, atomic number and atomic mass
The vertical column of elements which share chemical properties
Group
On the periodic table, the horizontal row of elements is a?
“Period”
The physical and chemical properties of the elements change across each period.
Alkali metals
Share physical and chemical properties... They are the most reactive They are soft They are shiny They are silver They have low density
Alkaline earth metals
Very reactive
Silver
Higher density than alkali metals
Transition metals
Less reactive than alkaline earth metals
They do not have individual names
Transition metals are…
Good conductors of heat
Shiny
Good conductors of electric current
Higher melting points than elements in groups 1&2
Lanthanides
Shiny, reactive metals, some of which are used to make steel
Actinides
All atoms of actinides are radioactive or unstable.
They do not occur naturally.
