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Questions and Answers
In a metallic crystal structure, what occupies every point in the crystal lattice?
In a metallic crystal structure, what occupies every point in the crystal lattice?
What are the mobile electrons in a metallic bond referred to as?
What are the mobile electrons in a metallic bond referred to as?
What type of attraction defines a metallic bond?
What type of attraction defines a metallic bond?
Why do metals conduct electricity and heat well?
Why do metals conduct electricity and heat well?
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What causes the luster observed in metals?
What causes the luster observed in metals?
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Study Notes
Work Plan
- Attendance/update
- Science routines
- Review (ionic and covalent bonding)
- Discussion (metallic bonding)
- Wrap up/agreement/reminders
Chemical Bonding: Metallic Crystals
- Pure metals are crystalline solids
- Unlike ionic compounds, each point in the crystal lattice is occupied by an identical atom.
Metallic Bonding
- The electrons in the outer energy levels of a metal are mobile
- They can drift from one metal atom to another.
- Metal is viewed as an array of positive ions surrounded by a sea of mobile valence electrons (delocalized electrons)
- A metallic bond is the attraction of the stationary metal cations to the surrounding mobile electrons.
Properties of Metals
- Conduction: Metals conduct electricity and heat well due to free-flowing electrons. As electrons enter one end of a metal, an equal number flow out the other end.
- Malleability and Ductility: Metals are malleable (can be hammered into shapes) and ductile (can be rolled into thin sheets or pulled into thin wires) because the free-flowing electrons allow the metal cations to slip past one another without breaking the bond.
- Luster: When light shines on a metal its electrons absorb small amounts of energy and become excited into empty orbitals. The electrons immediately fall back to lower energy levels and emit light - this causes the high luster of metals.
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Description
Test your knowledge on metallic bonding and the properties of metals in this quiz. Explore the unique characteristics of metallic crystals, such as conductivity, malleability, and ductility. Understand how metallic bonds differentiate from ionic and covalent bonding.
