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Periodic Table of Elements Continued...

Properties of Metals and Non Metals

Mark Imhoof

on 2 June 2010

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Transcript of Periodic Table of Elements Continued...

Periodic Table of Elements
Metals and NonMetals. Distiguished by
ability to lose
electons (ionization)
and bonding properties. Metals are usually inclined to form positive charged ions through electron loss, reacting with oxygen in the air to form oxides over changing timescales (iron rusts over years, while potassium burns in seconds) Examples:

4 Na + O2 2 Na2O (sodium oxide)
2 Ca + O2 2 CaO (calcium oxide)
4 Al + 3 O2 2 Al2O3 (aluminium oxide) Metals in general have high electrical conductivity, thermal conductivity, luster and density, and the ability to be deformed under stress without cleaving. There is no rigorous definition for the term "nonmetal" Common properties considered characteristic of a nonmetal include:

* poor conductors of heat and electricity when compared to metals
* they form acidic oxides (whereas metals generally form basic oxides)
* in solid form, they are dull and brittle, rather than metals which are lustrous, ductile or malleable
* usually have lower densities than metals
* they have significantly lower melting points and boiling points than metals
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