PLEASE remember. . . DON”T write everything down  The Periodic Table PLEASE remember. . . DON”T write everything down 

Why is the Periodic Table important to me? It organizes lots of information about all the known elements.

Pre-Periodic Table Chemistry … …was a mess!!! No organization Imagine going to a grocery store with no organization!!

Dmitri Mendeleev: Father of the Table rows - increasing atomic weight. columns - way they reacted.

There were some problems… blank spaces broke the pattern of increasing atomic weight to keep behaviors together There were some problems…

The Current Periodic Table . . . Moseley ATOMIC NUMBER!! The Current Periodic Table . . . Moseley

Elements in the same group share chemical and physical properties Why?? They have the same number of valence electrons. . . . Like Mendeleev

Families Behave the same

Hydrogen What’s happening in this picture??? A family all its own! Hydrogen is a diatomic, reactive gas. Hydrogen is promising as an alternative fuel source for automobiles What’s happening in this picture???

Alkali Metals Group 1 not including hydrogen. Very reactive metals, always combined with something else Soft enough to cut with a butter knife

Alkaline Earth Metals Which is more reactive: Group 1 or Group 2??? Also reactive metals Several of these elements are important mineral nutrients (such as Mg and Ca Which is more reactive: Group 1 or Group 2???

Transition Metals groups 3-12 Less reactive harder metals used in jewelry and construction.

Boron Family group 13 Aluminum metal was once rare and expensive, not a “disposable metal.”

Carbon Family Elements in group 14 Contains elements important to life and computers. Carbon is the basis for an entire branch of chemistry. Silicon and Germanium are important semiconductors.

Nitrogen Family group 15 Nitrogen makes up over ¾ of the atmosphere. The red stuff on the tip of matches is phosphorus.

Oxygen Family or Chalcogens group 16 Many things that stink, contain sulfur (rotten eggs, garlic, skunks, etc.)

Halogens Elements in group 17 Very reactive, volatile, diatomic, nonmetals Always found combined with other element in nature . Used as disinfectants and to strengthen teeth.

The Noble Gases

The Noble Gases How many electrons make you happy? Group 18 Group 8a VERY stable, gases “neon” signs Have a full valence shell.

Let’s Review!!! Name the Group . .

Now . . . Let’s Mix It Up 