Enwikipediaorg 4 bond characteristics

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: tron • Bond may be strong or weak (wide range of bonding energies) 3 Covalent Bonding Polymer bonding is covalent. en.wikipedia.org 4 %Bond Characteristics • Interatomic bonds can be partially ionic and partially covalent. • Degree of either bond type depends on electronegativity % ionic character = [1‐exp{‐0.25(XA‐XB)2}]×100 XA and XB are electronegativities 5 Metallic Bonding • Metals easily give away the electrons to form electron cloud • Metal ions form “ion cores” • Bonding energy range from 68 kJ/mol to 850 kJ/mol. • Conductivity can be explained by free electrons in the cloud. 6 Metallic Bonding 7 Secondary Bonding • Van der Waals • Weak bonds • Can be obscured due to presence of primary bonds • Visible in noble gases • Forces between atomic or molecular dipoles • Induced dipole – Induced dipole • Induced dipole – Polar molecule • Polar molecule – Polar molecule 8 Secondary Bonding • Hydrogen Bonding • Example of Van der Waals bonding • Involved H atom as an constituent of the molecules • Induced dipoles ‐ Liquefaction/Solidification of inert gases or electrically neutral and symmetric molecules • Polar molecules can induce dipoles 9 Bonding Energies and Melting 10 Summary • Covalent bonds are sharing of electrons, directional and can be either weak or strong • Metallic bonding is metal ions in the electron cloud, strong, non‐directional • Secondary bonding is weak and due to dipoles or polar molecules. 11...
View Full Document

Ask a homework question - tutors are online