Atoms,Molecules,Elements and Compounds

Atoms,Molecules,Elements and Compounds -...

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Atoms,Molecules,Elem ents and Compounds Fabiha Zuberi 357
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                                              Atoms      According to Greek philosophers,the smallest particle  of matter is an atom. A particle that cannot be further  subdivided. There are three basic parts of an atom which  are the electrons, protons, and neutrons.
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   Molecules     A molecule is an electrically neutral group of at  least two atoms held together by covalent chemical  bonds.       A molecule may consist of atoms of a  single chemical element, as with oxygen (O2), or of  different elements, as with water(H2O). Atoms and  complexes connected by non-covalent bonds such  as hydrogen bonds or ionic bonds are generally not  considered single molecules.
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Elements     A chemical element is a pure chemical  substance consisting of one type of atom distinguished 
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This note was uploaded on 01/17/2012 for the course MASS COMMU 107 taught by Professor Masror during the Spring '11 term at College of E&ME, NUST.

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Atoms,Molecules,Elements and Compounds -...

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