Atom

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The atom is defined as the smallest subdivision of an [[Element|element]]. &nbsp;Atoms of the same [[Element|element]] have the same size, mass and chemical properties <ref>http://js082.k12.sd.us/My_Classes/Physical_Science/atoms/atoms_1.htm</ref>.&nbsp;
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The atom is defined as the smallest subdivision of an [[Element|element]]. &nbsp;Atoms of the same [[Element|element]] have the same size, mass and chemical properties <ref>http://js082.k12.sd.us/My_Classes/Physical_Science/atoms/atoms_1.htm</ref>.&nbsp;  
  
 
An atom is composed of three different particles: [[Protons|protons]]( p+ ), [[Neutrons|neutrons]]&nbsp;( n0 ) and [[Electrons|electrons]] ( e- ) .  
 
An atom is composed of three different particles: [[Protons|protons]]( p+ ), [[Neutrons|neutrons]]&nbsp;( n0 ) and [[Electrons|electrons]] ( e- ) .  
  
[[Protons|Protons]] and [[Neutrons|neutrons]] are located in the nucleus of the atom, whereas the [[Electrons|electrons]] spin around this [[Nucleus|nucleus]] in specific orbits <ref>http://js082.k12.sd.us/My_Classes/Physical_Science/atoms/atoms_1.htm</ref>&nbsp;<ref>http://www.emc.maricopa.edu/faculty/farabee/biobk/BioBookCHEM1.html</ref>.
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[[Protons|Protons]] and [[Neutrons|neutrons]] are located in the nucleus of the atom, whereas the [[Electrons|electrons]] spin around this [[Nucleus|nucleus]] in specific orbits <ref>http://js082.k12.sd.us/My_Classes/Physical_Science/atoms/atoms_1.htm</ref>&nbsp;<ref>http://www.emc.maricopa.edu/faculty/farabee/biobk/BioBookCHEM1.html</ref>.  
  
Both the number of [[Protons|protons]] and [[Neutrons|neutrons]] are equal with the [[Atomic mass|atomic mass]] of an element, whereas the number of [[Protons|protons]] equals with the number of the [[Electrons|electrons]] of the same element and are equal with the [[Atomic number|atomic number]] of this [[Element|element]]&nbsp;<ref>http://www.clickandlearn.org/Gr9_Sci/atoms/modelsoftheatom.html</ref>.
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The addition of&nbsp;the number of [[Protons|protons]] and [[Neutrons|neutrons]]&nbsp;produces the&nbsp;[[Atomic mass|atomic mass]] of an&nbsp;element, whereas the number of [[Protons|protons]] equals with the number of the [[Electrons|electrons]] of the same element and are equal with the [[Atomic number|atomic number]] of this [[Element|element]]&nbsp;<ref>http://www.clickandlearn.org/Gr9_Sci/atoms/modelsoftheatom.html</ref>. The number of neutrons can vary significantly especially in [[radioactive|radioactive]] elements.&nbsp;
  
How the atom really is structured had been a serious matter for many centuries and different theories raised from Democritus (c.300 BC), Dalton (c.1800), J.J. Thomson (c.1850), Rutherford (c. 1905), Neils Bohr , Bohr- Rutherford (c. 1920) to “Modern theory” which describes the orbits of the spinning [[Electrons|electrons]] around the [[Nucleus|nucleus]] as a "cloud of energy levels"&nbsp;<ref>http://www.clickandlearn.org/Gr9_Sci/atoms/modelsoftheatom.html</ref>&nbsp;<ref>http://www.clickandlearn.org/chemistry/atomic_theory.htm</ref>.
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How the atom really is structured had been a serious matter for many centuries and different theories raised from Democritus (c.300 BC), Dalton (c.1800), J.J. Thomson (c.1850), Rutherford (c. 1905), Neils Bohr , Bohr- Rutherford (c. 1920) to “Modern theory” which describes the orbits of the spinning [[Electrons|electrons]] around the [[Nucleus|nucleus]] as a "cloud of energy levels"&nbsp;<ref>http://www.clickandlearn.org/Gr9_Sci/atoms/modelsoftheatom.html</ref>&nbsp;<ref>http://www.clickandlearn.org/chemistry/atomic_theory.htm</ref>.  
  
=== References ===
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=== References ===
  
 
<references />&nbsp;
 
<references />&nbsp;

Revision as of 10:41, 14 November 2011

The atom is defined as the smallest subdivision of an element.  Atoms of the same element have the same size, mass and chemical properties [1]

An atom is composed of three different particles: protons( p+ ), neutrons ( n0 ) and electrons ( e- ) .

Protons and neutrons are located in the nucleus of the atom, whereas the electrons spin around this nucleus in specific orbits [2] [3].

The addition of the number of protons and neutrons produces the atomic mass of an element, whereas the number of protons equals with the number of the electrons of the same element and are equal with the atomic number of this element [4]. The number of neutrons can vary significantly especially in radioactive elements. 

How the atom really is structured had been a serious matter for many centuries and different theories raised from Democritus (c.300 BC), Dalton (c.1800), J.J. Thomson (c.1850), Rutherford (c. 1905), Neils Bohr , Bohr- Rutherford (c. 1920) to “Modern theory” which describes the orbits of the spinning electrons around the nucleus as a "cloud of energy levels" [5] [6].

References

  1. http://js082.k12.sd.us/My_Classes/Physical_Science/atoms/atoms_1.htm
  2. http://js082.k12.sd.us/My_Classes/Physical_Science/atoms/atoms_1.htm
  3. http://www.emc.maricopa.edu/faculty/farabee/biobk/BioBookCHEM1.html
  4. http://www.clickandlearn.org/Gr9_Sci/atoms/modelsoftheatom.html
  5. http://www.clickandlearn.org/Gr9_Sci/atoms/modelsoftheatom.html
  6. http://www.clickandlearn.org/chemistry/atomic_theory.htm
 
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