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Atomic structure

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Ministry of Education Malaysia
Ministry of Education Malaysia

general chemistry

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ATOMIC STRUCTURE
DEVELOPMENT OF ATOMIC MODEL Plum Pudding Model -discovery of electron 1897- put forward the “plum pudding” model of the atom. The atom is like a sphere with small electrons embedded in a positively charged mass J.J Thompson (1856-1940) An atom is like a miniature billiard ball 1808- suggested that matter is made of tiny particles which are indivisible and indestructible John Dalton (1766-1844) Atomic Model Atomic Structure Scientist
- - - - - Rutherford’s Solar System Model ,[object Object],[object Object],[object Object],[object Object],Ernest Rutherford (1871-1937) Atomic Model Atomic Structure Scientist
[object Object],[object Object],[object Object],James Chadwick (1891-1974) Bohr’s electrons orbiting in shells ,[object Object],[object Object],[object Object],Niels Bohr (1885-1962) Atomic Model Atomic Structure Scientist
[object Object],[object Object],[object Object],[object Object],[object Object],SUBATOMIC PARTICLES proton neutron shell electron { nucleon + +
THE PROPERTIES OF SUBATOMIC PARTICLES ,[object Object],_1__ 1840 1 1 Relative mass -1 0 +1 Relative electric charge e ¯ n p Symbol Electron Neutron Proton Subatomic particles
PROTON NUMBER ,[object Object],Proton number = number of protons
NUCLEON NUMBER ,[object Object],Nucleon number = number of protons + number of neutrons
NUMBER OF NEUTRONS ,[object Object],[object Object],[object Object],Number of neutrons = nucleon number – proton number
[object Object],[object Object],[object Object],[object Object],[object Object],A X Z
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],32 S 16 32-16 = 16
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],27 Al 13 27 – 13= 14
[object Object],[object Object],[object Object],[object Object],23 Na 11 11 = 23 - 11 = 12 11
Exercises ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

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Atomic structure

  • 2. DEVELOPMENT OF ATOMIC MODEL Plum Pudding Model -discovery of electron 1897- put forward the “plum pudding” model of the atom. The atom is like a sphere with small electrons embedded in a positively charged mass J.J Thompson (1856-1940) An atom is like a miniature billiard ball 1808- suggested that matter is made of tiny particles which are indivisible and indestructible John Dalton (1766-1844) Atomic Model Atomic Structure Scientist
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