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A covalent bond formed through side-on overlap of compatible atomic orbitals, with a nodal plane containing the internuclear axis.
A coordinate covalent bond is described as forming by donation of a lone pair from one partner into an acceptor orbital of the other. This formation description does not imply that the final electrons remain distinguishable by origin.
A delta bond involves sideways orbital overlap with two nodal planes containing the internuclear axis. In suitable metal-metal bonds, d-orbital overlap can supply this component in addition to sigma and pi bonding.
A formal fourfold bond. In the familiar d-metal example, one sigma bond, two pi bonds and one delta bond are occupied, giving the configuration and formal bond order four.
A formal bond order of five. The common d-metal model has one sigma, two pi and two delta bonding orbitals occupied, , with the corresponding antibonding orbitals empty.
A bond with formal bond order one, conventionally represented by one line. Delocalization can make the actual bond order differ from the integer in one Lewis structure.
A bond with formal bond order three. A localized orbital description usually contains one sigma and two pi components.
A statistical copolymer contains more than one kind of monomer unit, with their sequence distribution following a specified statistical rule. A random copolymer is a special case when an appropriate independence model describes the sequence.
Monomer reactivity can produce correlations, composition drift, or blocks longer than a simple random model predicts. Describing only the average monomer fractions therefore does not determine the complete sequence structure or material properties.
A complex with an accessible coordination site or low electron count that permits coordination ligand capture. electron deficiency and geometric accessibility must both be assessed.
Consistent influence on the initiation or direction of group action. Leadership may arise from differences in motivation and information together with followers’ responses.
Pinned article: Introduction to the OurBigBook Project
Welcome to the OurBigBook Project! Our goal is to create the perfect publishing platform for STEM subjects, and get university-level students to write the best free STEM tutorials ever.
Everyone is welcome to create an account and play with the site: ourbigbook.com/go/register. We belive that students themselves can write amazing tutorials, but teachers are welcome too. You can write about anything you want, it doesn't have to be STEM or even educational. Silly test content is very welcome and you won't be penalized in any way. Just keep it legal!
Intro to OurBigBook
. Source. We have two killer features:
- topics: topics group articles by different users with the same title, e.g. here is the topic for the "Fundamental Theorem of Calculus" ourbigbook.com/go/topic/fundamental-theorem-of-calculusArticles of different users are sorted by upvote within each article page. This feature is a bit like:
- a Wikipedia where each user can have their own version of each article
- a Q&A website like Stack Overflow, where multiple people can give their views on a given topic, and the best ones are sorted by upvote. Except you don't need to wait for someone to ask first, and any topic goes, no matter how narrow or broad
This feature makes it possible for readers to find better explanations of any topic created by other writers. And it allows writers to create an explanation in a place that readers might actually find it.
Figure 1. Screenshot of the "Derivative" topic page. View it live at: ourbigbook.com/go/topic/derivativeVideo 2. OurBigBook Web topics demo. Source. - local editing: you can store all your personal knowledge base content locally in a plaintext markup format that can be edited locally and published either:This way you can be sure that even if OurBigBook.com were to go down one day (which we have no plans to do as it is quite cheap to host!), your content will still be perfectly readable as a static site.
- to OurBigBook.com to get awesome multi-user features like topics and likes
- as HTML files to a static website, which you can host yourself for free on many external providers like GitHub Pages, and remain in full control
Figure 2. You can publish local OurBigBook lightweight markup files to either OurBigBook.com or as a static website.
Figure 3. Visual Studio Code extension installation.
Figure 5. . You can also edit articles on the Web editor without installing anything locally. Video 3. Edit locally and publish demo. Source. This shows editing OurBigBook Markup and publishing it using the Visual Studio Code extension. 
- Infinitely deep tables of contents:
All our software is open source and hosted at: github.com/ourbigbook/ourbigbook
Further documentation can be found at: docs.ourbigbook.com
Feel free to reach our to us for any help or suggestions: docs.ourbigbook.com/#contact