families of elements. groups columns elements in the same group have the same number of valence...
TRANSCRIPT
Periods• Horizontal Rows• As you move from
left to right the atomic number increases
• So the # of protons and electrons also increases
Alkali Metals
• Lithium
• Sodium
• Potassium
Alkali Metals in Nature
• Because they are so reactive they are not found as elements in nature
• Instead they combine with other elements to form compounds
Alkaline Earth Metals
• Have two valence electrons
• Less reactive than the alkali metals
• Make bonds with other elements very easily
Calcium• Make up the
hard shells of many sea animals
• Found in bones and teeth
• Also found in green leafy vegetables
Transition Metals• Copper is used for electrical wiring and
plumbing
• Light bulb filaments are made of tungsten
• Mercury is used in thermometers
Bottom two rows of transition metals
• Keeps the table narrow so that similar elements still line up
• Elements with a atomic number higher than 92 are man-made
Carbon Compounds
• Found in living and non-living things
• Glucose
• Chlorophyll
• Gasoline
• Rubber Tires