The Periodic Table of Elements
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Transcript of The Periodic Table of Elements
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The Periodic Table of Elements
Ms. Williams
7th Grade Science
Allen Middle School
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Dmitri Mendeleev (1834-1907)
• Russian Chemist• Published the first
version of the period table in 1869
• Arranged elements according to increasing atomic mass
• His periodic table had gaps
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Henry Moseley (1887-1915)
• Made improvements to Mendeleev’s Periodic Table
• Arranged elements by atomic number instead of mass
• Realized that there were undiscovered elements
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The Modern Periodic Table
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The Element Key
The Element Key provides lots of important information
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Time for Vocabulary
• Period: A row of elements on a periodic table. Remember rows fly across.
•Group: a column of elements on a periodic table that share similar characteristic. Remember groups fall down.
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More Vocabulary
• Metal: an element that has luster and is a good conductor of heat and electricity.
• Nonmetal: elements that are usually gases or brittle solids at room temperature and are poor conductors of heat and electricity.
• Metalloid: an element that shares some properties with metals and some with nonmetals.
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Representative Elements
• Groups 1-2 & 13-18• Alkali Metals• Alkaline Earth Metals• The Boron Family• The Carbon Group• The Nitrogen Group• The Oxygen Group• The Halogens• The Noble Gases
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The Alkali Metals
• Group 1 Elements: -Lithium -Rubidium -Sodium -Cesium -Potassium -Francium• Silvery Solids• Low Densities• Low Melting Points
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The Alkaline Earth Metals
• The Group 2 Elements -Beryllium -Magnesium -Calcium -Strontium -Barium -Radium• Denser than Alkali
Metals• Higher melting points
than Alkali Metals
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The Boron Family
• Group 13 Elements -Boron -Aluminum -Gallium -Indium -Thallium• All are metals except
Boron• Aluminum is the most
common metal in the Earth’s crust.
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The Carbon Group
• Group 14 Elements -Carbon -Silicon -Germanium -Tin -Lead• Silicon is used to make
semiconductors for computers and other electronics .
• Diamond and Graphite are two forms of carbon.
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The Nitrogen Group• Group 15 Elements -Nitrogen -Phosphorus -Arsenic -Antimony -Bismuth• Almost 80% of the air we
breathe is nitrogen.• Phosphorus is an
essential ingredient in healthy teeth and bones.
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The Oxygen Group
• Group 16 Elements -Oxygen -Sulfur -Selenium -Tellurium -Polonium• About 20% of the
Earth’s atmosphere is oxygen.
• Sulfuric acid is one the most used chemicals in the world
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The Halogens
• Group 17 Elements -Fluorine -Chlorine -Bromine -Iodine -Astatine• The Halogens form salts
with the alkali metals.• Fluorine is an active
ingredient in toothpaste.
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The Noble Gases
• Group 18 Elements -Helium -Neon -Argon -Krypton -Xenon -Radon• Helium is used to fill
balloons.• Neon signs contain
noble gases.
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Transition Elements• Groups 3-12• All transition
elements are metals.• Group 11 (The
Coinage Metals)• The Lanthanides• The Actinides
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The Coinage Metals
• Group 11 Elements -Copper -Gold -Silver• These elements
were often used by ancient civilizations to make coins.
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The Lanthanides and The Actinides
• The Lanthanides• Soft metals that can
be cut with a knife.• Were once called rare
earth metals.• Glass used in
computer and TV screens contain Yttirum and Europium.
• The Actinides• All actinides are
radioactive.• Thorium, Proactinium
and Uranium are the only actinides found naturally on earth.
• Plutonium is used to fuel nuclear power plants.
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Let’s See What We Remember
• What are rows on a periodic table called?
• What are columns on a periodic table called?
• Name the two divisions of the periodic table?
• What can we learn from an element key?
• How can scientist use the periodic table?
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The End
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