Transition Elements Chapter 5 Section 3

The Metals in the Middle  Remember from Section 1 that the Transition elements are in groups 3-12  Transition elements don’t change properties as much as Representative elements do

The Iron Triad  Most transition elements are already combined with other transition metals— ores  The iron triad is made of three elements in period 4. Iron- Fe, Cobalt- Co, and Nickel- Ni

Uses  Transition Elements have a wide variety of uses: Tungsten- light bulbs Tungsten- light bulbs Mercury- Thermometers Mercury- Thermometers Chromium- paint colors Chromium- paint colors Ruthenium, Rhodium, palladium, osmium, iridium and platinum- catalyst Ruthenium, Rhodium, palladium, osmium, iridium and platinum- catalyst Catalyst- substance that makes a reaction happen faster but doesn’t change the reactionCatalyst- substance that makes a reaction happen faster but doesn’t change the reaction

Inner Transition Elements  WE have already sort of talked about the two series of inner elements---these are the funny ones on the bottom of the table The Lanthanide’s The Lanthanide’s The Actinide’s The Actinide’s

Lanthanide Series  Rare earth’s—because they were once thought to be scarce  Soft metals  Very hard to separate when they are in an ore together—they are so similar in properties

Actinide Series  Are ALL radioactive  Thorium, Protactinium and uranium are the only NATURALLY occurring elements on Earth  The rest are Synthetic elements Synthetic--- made in laboratories and nuclear reactors Synthetic--- made in laboratories and nuclear reactors

Dentistry  Dentists have been using amalgam to fill cavities Amalgam is a mixture of silver, copper, tin and mercury Amalgam is a mixture of silver, copper, tin and mercury Since mercury is poisonous people have complained or stressed their concernSince mercury is poisonous people have complained or stressed their concern Dentist now use a combination of chemically resistant resins, porcelains and composites. Dentist now use a combination of chemically resistant resins, porcelains and composites.

An after thought  What are the two Inner transition series called and what is a trait of each?