in 1869, russia's dmitri mendeleev and germany's lothar meyer... meyer mendeleev
TRANSCRIPT
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In 1869, Russia's Dmitri Mendeleev and Germany'sLothar Meyer...
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Meyer Mendeleev
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published nearly identicalclassification tables for the 63elements known at the time...
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Meyer Mendeleev
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based on recurring chemicaland physical properties whenelements were arranged...
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Meyer Mendeleev
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in order of increasingatomic weight.
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Meyer Mendeleev
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Mendeleev
Although their observationswere identical, Mendeleev isgiven the credit becausehe predicted theexistence ofundiscoveredelements and leftspaces for them.
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Mendeleev's table, published in the journal Annalen der Chemie in 1871.
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Mendeleev isknown as the Father of the Periodic Table.
And almost no one outside ofGermany knows about Meyer.
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In 1913, Henry Moseleydeveloped the concept of atomic numbers.
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Moseley correctly saidthat the atomicnumber wasequal to thenumber ofprotons in thenucleus...
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AND the numberof electrons inthe atom.
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When Moseley arrangedatoms by their increasingatomic number,the few problems with Mendeleev's table disappeared.
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In 1945, Glenn Seaborgproposed pulling the lanthanide and actinideseries out ofthe main bodyof elements onthe table.
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Seaborg
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Elements on today's periodic table are arranged byincreasing atomic number...
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the lanthanide and actinide series are separated from the main body...
f block
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AND the d block elements...
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separate the main body elements.
s block p block
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Every element is representedby a single square.
Each square containsthree things:
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1. The chemical symbol for the element.
If there are two letters,the first is ALWAYSa capital letter, and the second is ALWAYSa small letter.
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1. The chemical symbol for the element.
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Solid
The symbols on some tables indicate the physical state at room temperature.
Liquid Gas
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2. A whole number representing the atomic number.
The atomic number is notalways in the sameplace on everyperiodic table -but it is ALWAYSa whole number.
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2. A whole number representing the atomic number.
The atomic number is definedas the number ofprotons in the atom.
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2. A whole number representing the atomic number.
Normal atoms have an equalnumber of protonsand electrons - so,the atomic numberis also equal to theelectrons in an atom.
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2. A whole number representing the atomic number.
Chemists can change thenumber of electrons inan atom, but theycan NOT change thenumber of protonsin an atom.
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2. A whole number representing the atomic number.
Changing the number ofprotons changes theelement into anotherelement - this canonly happen in anuclear reaction.
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3. A decimal fraction number representing the element's average atomic mass.
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3. A decimal fraction number representing the element's average atomic mass.
The atomic massof an element isthe sum of itsprotons andneutrons.
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Atoms of an element all havethe same numbers of protons,but they can have differentnumbers of neutrons.
H1
1.00794
Hydrogen-1Hydrogen-2Hydrogen-3
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Atoms of an element all havethe same numbers of protons,but they can have differentnumbers of neutrons.
H1
1.00794
Hydrogen-1Hydrogen-2Hydrogen-3
How manyneutrons?
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Atoms of an element all havethe same numbers of protons,but they can have differentnumbers of neutrons.
H1
1.00794
Hydrogen-1Hydrogen-2Hydrogen-3
0
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Atoms of an element all havethe same numbers of protons,but they can have differentnumbers of neutrons.
H1
1.00794
Hydrogen-1Hydrogen-2Hydrogen-3
How manyneutrons?
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Atoms of an element all havethe same numbers of protons,but they can have differentnumbers of neutrons.
H1
1.00794
Hydrogen-1Hydrogen-2Hydrogen-3
1
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Atoms of an element all havethe same numbers of protons,but they can have differentnumbers of neutrons.
H1
1.00794
Hydrogen-1Hydrogen-2Hydrogen-3
How manyneutrons?
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Atoms of an element all havethe same numbers of protons,but they can have differentnumbers of neutrons.
H1
1.00794
Hydrogen-1Hydrogen-2Hydrogen-3
2
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Atoms of the same elementwith different numbers of neutrons are called isotopes.
H1
1.00794
Hydrogen-1Hydrogen-2Hydrogen-3
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Which of hydrogen's threeisotopes is the most common?
H1
1.00794
Hydrogen-1Hydrogen-2Hydrogen-3
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Which of hydrogen's threeisotopes is the most common?
H1
1.00794
Hydrogen-1Hydrogen-2Hydrogen-3
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Round off all mass numbersto the nearest WHOLE number.
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Isotopes
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More information onthe Periodic Table
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The Nobel GasFamily ischemicallyinactive.
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Fluorine is the most active nonmetal
Francium is the most active metal
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The oxidation number of an element indicates the number of electrons gained or lost when forming compounds.
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Elements with positive oxidation numbers lose electrons.
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Elements with negative oxidation numbers gain electrons.
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+1
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+2
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+1, +2, +3
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+3
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+4 or -4
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-3
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-2
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-1
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Electron energy levels, from 1 to 7
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Electron energy sublevels
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Electron energy sublevel s
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Electron energy sublevel p
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Electron energy sublevel d
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Electron energy sublevel f
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Each "pair" of boxes in a sublevelindicates an orbital.
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Vertical columns are Families -
elements with similar properties.
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Alkali Metals
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Alkaline Earth Metals
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Transition Metals
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Rare Earth Metals
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Boron Family
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Carbon Family
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Nitrogen Family
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Oxygen Family
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Halogen Family
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Nobel Gas Family
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The Periodic Table - 27 min
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Size of a Molecule
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An Electron Configuration showsthe exact location of every electronin an atom.
With very few exceptions, theelectron configuration of an atomcan be read directly from the Table.