Periodic Table

Periodic TableWe need to be able to arrange these somehow to make it easier to locate the information.

Periodic Table

Periodic Table

Periodic Table

Periodic Table

Periodic TableElements were arranged by similar properties into rows

Elements were arranged by increasing atomic weight into columns

Periodic TableMendeleev encountered some problems while arranging the elements.

Periodic TableResult: Properties are more important than atomic mass when arranging the elements.Te and I Tellurium has a larger atomic mass than iodine, so Tellurium should go under Br.. Telluriums properties dont match up with that group. The properties match if you switch the elements, so Mendeleev placed Iodine after Tellurium.

Periodic TableAl and Si Mendeleev was ready to place Arsenic, and the next available spot was under Aluminum. Arsenics properties did not match that group or the group containing Silicon, so Mendeleev left two blank spaces and placed Arsenic after them.

Periodic TableResult: Mendeleev predicted that two new elements would be discovered in the future to fit in those spots. He also predicted their properties based on his arrangement. They were discovered years later- his predictions were surprisingly accurate!

Periodic Table

New AdditionsSince Mendeleevs time, other elements have been added to the periodic table.Noble Gases (Group 18)- the first 3 were discovered by William Ramsay (very hard because they are inert, dont react with anything)Lanthanides and Actinides- placed at the bottom of the table by Glenn SeaborgMany lab-created (synthetic) elements have been added at the bottom of the table

Periodic Table

Periodic Table

Atomic Number and Atomic MassAtomic number increases by 1 for each element. Increases down and to the right.Atomic mass also increases down and to the right. (These numbers are already on the table.)

Periodic TableThe periodic table can be separated into three main sections:

Periodic Table

Periodic Table

Periodic TableSoft, can be cut with a knife, 1 valence electron, react violently with water

Periodic TableH- explosive, flammableNa- heart healthK- salt substitute, bananasFr- radioactive

Periodic TableSame properties as group one but not as strong

Have two valence electrons

Periodic TableMg- white fireworks, flashbulbsCa- bones, teeth, hairBa- stomach testing

Periodic Table

Periodic TableCr- chromeFe- steel, hemoglobinNi- coins, base metalCu- pennies, pipes, wireZn- galvanizingAg- ornamental, jewelryAu- ornamental, jewelry, moneyHg- thermometer, toxic

Periodic TableF- toothpasteCl- cleans water systems, pools, bleachBr- medicationsI- antiseptic (cleans germs from cuts)

Periodic TableDissolve in water and alcohol, form salts with groups 1 and 2, great cleaning agents, seven valence electrons, most reactive elements on the periodic table

Periodic TableStable, unreactive gases, eight valence electrons

Periodic TableHe- balloonsNe- lights, signsAr- light bulbsRn- radioactive gas

Periodic TableInner transition elements, Rare earth elements, Lanthanides and ActinidesMany of the top row are used in electronics, bottom row is mostly radioactive

Periodic Table

Important elementsC- makes up living thingsN- atmosphere, plants, explosivesO- air, rocks, most common element on EarthSi- computer chipsP- glow in the dark, fertilizers, DNAS- smelly, medicationsAs- poisonSn- antiquePb- old paint, solder, bullets

Periodic Table

Periodic Table

Periodic Table

Periodic Table

Periodic Table

Periodic Table