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1
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2
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3
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- The periodic table is a chemistry reference
- It arranges all the known elements in an informative grid
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4
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- Elements are arranged left to right and top to bottom in order of
increasing atomic number
- This order usually coincides with increasing atomic mass
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5
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- The Table's pattern and arrangement shows the arrangement of electrons
in the atom.
- Elements have different atomic numbers - the number of protons or
electrons increases up the table as electrons fill the shells.
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6
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- Elements have different atomic masses - the number of protons plus
neutrons increases up the table.
- Rows - elements of each row have the same number of energy levels
(shells).
- Columns - elements have the same number of electrons in the outermost
energy level or shell (one to eight).
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7
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- The different rows of elements are called periods.
- The period number of an element signifies the highest energy level an
electron in that element occupies
- The different columns of elements are called groups or families
- Elements in the same family have similar properties
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8
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9
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10
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11
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- Atomic Number
- The number of protons in an atom identifies the element.
- The number of protons in
an atom is referred to as the atomic number of that element.
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12
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- Atomic Symbol:
The atomic symbol is one or two letters chosen to represent an
element ("H" for "hydrogen," etc.).
- These symbols are used every
where in the world
- Usually, a symbol is the abbreviation of the element or the
abbreviated Latin name of the element.
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13
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- Atomic Mass:
The atomic mass is the average mass of an element in atomic mass
units ("amu").
- Though individual atoms always
have a whole number of amus, the atomic mass on the periodic table is
shown as a decimal number because it is an average of all the isotopes
of an element.
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14
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- http://www.chemicalelements.com/
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15
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- http://www.chemsoc.org/viselements/pages/periodic_table.html
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16
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- http://web.buddyproject.org/web017/web017/
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Notes
