Transcript of History of the Periodic Table 1790s Antoine Lavoisier compiled a list of the 23 known elements 1864...
- Slide 1
- History of the Periodic Table 1790s Antoine Lavoisier compiled
a list of the 23 known elements 1864 John Newlands named the
periodic relationship that he observed in chemical properties the
Law of the Octaves
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- 1869 Demetri Mendeleev Demonstrated a connection between atomic
mass and elemental properties. Organized the first Periodic Table
of the Elements Predicted the existence and properties of
undiscovered elements Arranged his Periodic Table according to
increasing ATOMIC MASSES of the elements
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- In 1870 there were about 70 known elements
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- In 1911 Henry Moseley Discovered that atoms of each element
contain a unique number of protons in their nucleus Arranged the
elements in increasing ATOMIC NUMBER rather than atomic masses as
Mendeleev had done
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- Periodicity- A repeating pattern Periodic Law- States that the
chemical and physical properties of elements are periodic functions
of their atomic number Periodic Table- A chart organizing elements
by their INCREASING atomic number.
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- FAMILIES YOU MUST KNOW Family # 1- Alkali Metals Family,
Lithium Francium (Li-Fr) excluding Hydrogen because it is NOT a
metal. Hydrogen is a gas! Family #2- Alkaline Earth Metals, (Be
Ra)
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- Family # 17- The Halogens Fluorine Astatine (F At) Family # 18-
The Noble Gases Helium Radon Transition Metals Families 3 12 the d
block
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- Periods 6 and 7 Lanthanides Rare Earth Metals, used in TV
Period 6 Elements # 58 71 Very Colorful
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Actinides Radioactive elements 90 --103 Period 7 Most are synthetic
or man-made
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- Representative Elements Elements within the s and the p
blocks
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- ZIG-ZAG LINE The zig-zag line separates the metals from the non
metals Metals on the left of the zig-zag line Non metals to the
right of the zig-zag line
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- Metalloids Metalloids are elements located next to the zig- zag
line with the EXCEPTION OF ALUMINUM Metalloids include the
following: Boron, B Arsenic, As Silicon, Si Antimony, Sb Germanium,
Ge Telurium, Te Polonium, Po
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- Metalloids exhibit properties of both metals and non metals -
They are somewhat poor conductors - called semi conductors - used
in computers, cell phones, etc.
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