(I can identify groups and periods; metals vs. non-metals, and the mass number; atomic number, and symbol of elements)

The Periodic Table of the Elements

 Group - vertical columns of elements that share properties and have the same number of electrons in their outermost shell  Period – horizontal rows of elements where the number of the row is the highest energy level (last electron shell)

 Metal - This includes all elements in groups 1 – 12 and are broken down into 3 categories: alkali, alkaline-earth, and transition  Non-metals – Groups are broken into 4 groups named after the element at the top of the group.

 Halogens – Group 17, very reactive, poor conductors  Noble gases – Group 18, colorless, odorless gasses that tend to not react with other elements  Metalloid – an element that shares some properties with a metal and some of a non-metal

 Mass number –the total number of protons and neutrons in an atom (the nucleus of it)  Atomic number – equal to the number of protons in an atom (in a stable atom, equal to the number of electrons, too)

 REALLY REALLY REALLY REACTIVE!  Not found in their pure form in nature  Silver colored and shiny  Low density  Soft enough to be cut with a knife  One outer level electron

 Slightly less reactive than alkali metals  Silver colored  More dense than alkali metals  Two outer level electrons

 Moderate range of reactivity  Wide range of properties  Shiny  Good conductors of heat and electricity (generally)  High density  High melting points  One or two outer level electrons (they’re a bit odd)

 Transition metals that just didn’t fit in well, so they got moved to the bottom  Lanthanides are shiny and reactive  Actinides are radioactive and unstable  Elements don’t exist in nature, but have been manufactured in the lab

 Boron Group – reactive, aluminum is in this group, which is the most abundant in the Earth’s crust, 3 outer level electrons  Carbon Group – varied reactivity, 4 outer level electrons  Nitrogen Group – varied reactivity, 5 outer level electrons  Oxygen Group – reactive, 6 outer level electrons

 ALL NON-METALS  Very reactive  Poor conductors of heat and electricity  Tend to form salts with metals (like NaCl – table salt)  7 outer level electrons (start at about 0:30 to about 1:25)

 Unreactive  Non-metal  Colorless  Odorless  Gasses at room temperature  Found in the atmosphere in SMALL amounts  8 outer level electrons

 Found along the “stairstep” between the transition metals and the non-metals  Includes the following elements: ◦ Boron (B) ◦ Silicon (Si) ◦ Germanium (Ge) ◦ Arsenic (As) ◦ Antimony (Sb) ◦ Tellurium (Te)  Elements “below” those listed are identified as metals (this includes tin (Sn), lead (Pb), indium (In) and bismuth (Bi))