Chemistry_Atom and Element

Information about Chemistry_Atom and Element

Published on July 21, 2014

Author: gurucemerlang



PowerPoint Presentation: SUBSTANCE ELEMENT COMPOUND ATOM MOLECULE MOLECULE ION Pure metal Noble gases He, Ne, Ar Cu, Mg, Ag Two similar atoms of non metal element share their valence electron to achieve octet/duplet electron arrangement (group 15, 16 and 17) N 2, O 2 , Cl 2, Br 2, I 2, H 2 Two different non metal atoms of element share their valence electron to achieve octet/duplet electron arrangement ( between group 15, 16 and 17) CO 2 , H 2 O , SO 2 Metal atom (group 1, 2, 13 release electrons to form positive ion). Non metal atom (group 15,16,17 receive electrons) to achieve octet/ duplet electron arrangement NaCl , CuSO 4 ELEMENT: ELEMENT A pure substance cannot be subdivided into any simpler substances by physical or chemical process COMPOUND A substance that contain two or more different types of elements that are chemically bonded together PowerPoint Presentation: Na DEVELOPMENT OF ATOMIC MODEL DALTON Idea of atom THOMSON Negatively charged electron Positively charged sphere RUTHERFORD Nucleus at the centre of atom contains positively charged proton Electrons move outside nucleus CHADWICK ATOMIC MODEL BOHR CHADWICK ATOMIC MODEL ELECTRON ARRANGEMENT FOR AN ATOM PowerPoint Presentation: Subatomic Particle Relative Mass Relative Charge Position Proton Electron Neutron 1 1/1840 1 +1 -1 0 Proton number : Total number of proton in the nucleus of an atom Nucleon number : Total number of proton and neutron in the nucleus of an atom In the nucleus In the shells PowerPoint Presentation: Standard Representation Of An Element A Z X X - Symbol of an element A – Nucleon number of atom X Z – Proton number of atom X ATOM: ATOM The smallest neutral particle of an element Normally pure metals, noble gases, a few non metal such as carbon and silicon Na PowerPoint Presentation: Sodium ELEMENT Na Na Na Na Na Na Na Na Na Na Na Na Na Na Na Na Na Na Na Na Na Na Na Na Na Na Na Na Sodium ELEMENT Sodium ELEMENT Sodium ELEMENT Sodium ATOM SODIUM ATOM: SODIUM ATOM Na Na Electron arrangement of sodium atom is 2.8.1 SODIUM ELEMENT: Sodium element consist with many sodium atoms Electron arrangement of sodium element is 2.8.1 Na Na Na Na Na Na Na Na Na Na Na Na Na Na Na Na Na Na Na Na Na Na Na Na Na Na SODIUM ELEMENT PowerPoint Presentation: 23 11 Na Standard Representation For Sodium Element The Structure Of Sodium Atom         11p + 12n The Electron arrangement Of Sodium Atom Na PowerPoint Presentation: Number of proton Number of electron Number of neutron Proton number Nucleon number Electron arrangement Number of valence electrons Group Number of shells Period 23 11 Na 11 11 12 11 12 2.8.1 1 1 3 3 PowerPoint Presentation: Electron Arrangements In Some Of Inert Gases Atoms All Inert Gases atoms have eight valence electrons (octet) except Helium which is stable. Helium atom has two valence electron (duplet) Why? Helium 2 (Duplet) Neon 2.8 (Octet) Argon 2.8.8 (Octet) He Ne Ar PowerPoint Presentation: EXAMPLE : PERIOD 3 ELEMENT ELEMENT Na Mg Al Si N S Cl Ar PROTON NUMBER 11 12 13 14 15 16 17 18 ELECTRON ARRANGEMENT 2.8.1 2.8.2 2.8.3 2.8.4 2.8.5 2.8.6 2.8.7 2.8.8 PowerPoint Presentation: I 2 13 14 15 16 17 18 1 2 3 4 5 6 GROUP PERIOD Inert Gases in The Periodic Table Of Element Why are these elements located in Group 18? PowerPoint Presentation: Each atom from group 1-17 elements has 1,2,3,4,5,6 and 7 valence electrons respectively. They are not stable . Each atom does not achieve octet electron arrangement. How do these atoms achieve stable octet/duplet electron arrangement? Atoms form CHEMICAL BONDS to achieve a stable duplet or octet electron arrangement. Bonds are formed when two or more atoms of elements are bonded together. PowerPoint Presentation: There are TWO TYPES OF CHEMICAL BOND: 1. IONIC BOND ( Particles form are positive ion and negative ion ) 2. COVALENT BOND. ( Particle forms is neutral molecule )

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