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DEVELOPMENT OF THE PERIODIC TABLE. First periodic table Noticed that trends repeat every 8 th element Developed the 14 known elements of the time by masses.

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Presentation on theme: "DEVELOPMENT OF THE PERIODIC TABLE. First periodic table Noticed that trends repeat every 8 th element Developed the 14 known elements of the time by masses."— Presentation transcript:

1 DEVELOPMENT OF THE PERIODIC TABLE

2 First periodic table Noticed that trends repeat every 8 th element Developed the 14 known elements of the time by masses Developed the Law of Octaves (repeat every 8) Ex: Valence Electrons JOHN NEWLANDS

3 Lothar Meyer (German) and Dmitri Mendeleev (Russian) Created the modern periodic table around the same time but they did not work together Mendeleev is given more credit because he published his work first Mendeleev left blank spaces Undiscovered elements Predicted the properties of these elements MEYER AND MENDELEEV

4 Rearranged the periodic table No longer by masses Now by atomic numbers Periodic Law Periodic repetition of chemical and physical properties of the elements when they are arranged by increasing atomic number HENRY MOSELEY

5 Metals: Most are malleable and ductile Generally shiny Most are solid at room temperature Good conductors of heat and electricity Non-metals Typically gases or brittle/dull looking solids Poor conductors of heat and electricity Most abundant element in the human body is a nonmetal Metalloids Properties of both metals and nonmetals METALS, NON-METALS, AND METALLOIDS

6 Also known as PERIODS Elements of the same row, fill in their electrons on the same shell Have similar properties: Atomic radius size Ionization energy electronegativity ROWS (LEFT TO RIGHT)

7 Known as FAMILIES/GROUPS Have very similar properties Same number of valence electrons Similarities are more significant than those of periods Reactiveness Bonding Physical properties (malleable/ductile/luster) *Similarities in FamiliesSimilarities in Families COLUMNS (TOP TO BOTTOM)

8 Metals Very reactive (1 valence electron) Shiny Light weight Soft metals Malleable/bendable Low melting points React violently in water Easily form salts Never found in the pure form in nature Uses: greases, batteries, salts, gasoline, fertilizers, and photography FAMILY/GROUP 1: ALKALI METALS

9 Highly reactive metals All have 2 valence electrons High melting points High densities Tarnish in air Never found in the pure form in nature Good conductors Uses: Fireworks, alloys, nuclear reactors, cancer treatment, etc. FAMILY/GROUP 2: ALKALINE EARTH METALS

10 Middle section of the periodic table Hard, strong, and shiny High melting points High densities Good conductors Never found in the pure form in nature Uses: Alloys, pipes, jewelry, cars, catalyst TRANSITION METALS

11 Lower two rows Lanthanide Series Rare Earth metals Soft, silvery metal Reactive Poor conductors Uses: Flint, glass, nuclear reactors, television screens, etc. Actinide Series All radioactive Silvery metals 4 are natural/rest are man made Uses: Nuclear power, pigment in glass, smoke detectors, atomic bombs (plutonium), metal detectors (americium) etc INNER TRANSITION METALS

12 Four separate but very similar families Have 3-6 valence electrons Metals, nonmetals, and metalloids Most are solids at room temp. Selectively reactive Uses: Essential to life, electronics, insulators, poisons, fertilizers, etc. BCNO FAMILIES

13 Highly reactive non-metals All have 7 valence electrons Poisonous All states of matter Never found in the pure form Poor conductors Selectively Reactive Very Rare Uses: Toothpaste, cleaner, photography, insecticides, GROUP/FAMILY 7: HALOGENS

14 Nonreactive non-metals 8 valence electrons Gaseous state Colorless Tasteless Odorless Uses: Balloons, lights, cancer treatment, headlights (xenon), light bulbs (argon), etc. FAMILY/GROUP 8: NOBLE GASES


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