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Honors Chemistry-Metallic Bonding (test #5)
Terms in this set (9)
Does chemical change take place during metallic bonding?
Define metallic bonding
The chemical bonding that results from the attraction between metal atoms and the surrounding sea of electrons; metals are held together by the attraction of metallic cation for the sea of electrons
Metals' valence electrons are highly mobile, giving them what kind of properties?
The ability to conduct electricity
Metal electrons move freely between the bonded metals in a sea of electrons; what are the electrons referred to as?
Delocalized; not held by any specific atom and can move freely
Because the electrons can move freely, what are some properties given?
Malleability, to be hammered against to flatten without breaking; ductility, the ability to stretch out into a wire; and low volatility, high melting and boiling point
*electrons interact with light creating a luster effect, a soft glow, as electrons are moving from excited to ground state
Describe the four main characteristics of metallic bonds
1.Outermost electrons move freely throughout; the metal consists of cations held together by negatively charged electron 'glue'
2. Free electrons can move rapidly in response to electric fields, thus causing metals to be a good conductor of electricity
3. Free electrons can transit kinetic energy rapidly, thus causing metals to be a good conductor of heat
4. The layers of atoms in metals are hard to pull apart because of the electrons holding them together, thus causing metals to be tough; but individual atoms are not held to any specific atom, resulting in atoms slipping past one another with ease, further causing metals to be ductile
Mixture of elements with metallic properties
Atoms of the original metal solid are replaced by other atoms of similar size; examples include Sterling silver, brass, and 10-carat gold. The more carats, the more gold, but less strength
Small holes or gaps (interstices) in the metallic crystal as filled by other smaller atoms (B, C, N, and Si); examples include steel, which is made of carbon and iron, carbon adds strength
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