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2 - ECE331 Atomic Structure Why study it Many properties of...

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1 Lu ECE331 Atomic Structure Why study it? Many properties of materials depend on (1)Bonds between atoms (2)Atomic packing (arrangement) e.g. Carbon (diamond, graphite, fullerences) Nucleus = Protons + Neutrons + Electrons (=no. of protons for neutrality) Lu ECE331 Nucleus diameter 10 -14 m Atomic diameter 10 -10 m 99.98% of mass is in nucleus & most of volume is electron cloud. Electrons in discrete orbitals or shells. Outer most shell contains VALENCE electrons (bonding, chemical, electrical, and thermal properties). These are of most important to us. Bohr model
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2 Lu ECE331 Lu ECE331 Atomic number – number of protons Atomic mass (amu) – relative atomic mass, or mass of 6.023×10 23 atoms of that element. e.g. 1 mole of Aluminum has a mass of 26.98 g. Table of elements: Most elements in Periodic Table are METALS . e.g. Mg, Zn, Fe, Ti. Few gases and non- metals and some in between. CERAMICS are usually based on compounds based on mixtures of elements, e.g. Cr 2 O 3 , Al 2 O 3 , Si 3 N 4 , SiC.
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