Oxygen atom on periodic table
8
O
15.9994
[He] 2s^2 2p^2
Isotopes
Isotopes are atoms of the same element that have different masses.
The Isotope of a particular element all have the same number of protons and electrons but different numbers of neutrons.
Most of the elements consist of mixtures of Isotopes .
Mass Number
Mass number is the total number of protons and neutrons that make up the nucleus of an isotope.
-The Atomic mass is a decimal
Designating Isotopes
Hyphen Notation: The mass number is written with a hyphen after the name of the element.
- Uranium – 235
Nuclear symbol: The superscript indicates the mass number and the subscript indicates the atomic number
- Mass Number Þ235 U
- Atomic NumberÞ92
The number of neutrons is found by subtracting the atomic number from the mass number.
- Mass number – Atomic number= Number of Neutrons
- 235 – 92 = 143 for U
Nuclide is a general term for a specific Isotope of and element.
http://www.ndt-ed.org/EducationResources/HighSchool/Radiography/atomicmassnumber.htm
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http://www.colorado.edu/physics/2000/isotopes/index.html
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http://hyperphysics.phy-astr.gsu.edu/hbase/nuclear/nucnot.html
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Helps explain Isotopes with helpful pictures
ReplyDeletehttp://www.colorado.edu/physics/2000/isotopes/index.html
http://www.nclark.net/PeriodicTable
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http://ie.lbl.gov/education/isotopes.htm
ReplyDeleteThis periodic table lists all (known) isotopes of all elements.
http://www.economicexpert.com/a/Atomic:number.htm
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