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Molecular Compounds: Formulas and Nomenclature

Molecular Compounds: Formulas and Nomenclature

Molecular compounds or covalent compounds result when atoms share electrons to form covalent bonds. Since there is no electron transfer, molecular compounds do not contain ions; instead, they consist of discrete, neutral molecules.

Coordination Compounds and Nomenclature

Coordination Compounds and Nomenclature

In most main group element compounds, the valence electrons of the isolated atoms combine to form chemical bonds that satisfy the octet rule. For instance, the four valence electrons of carbon overlap with electrons from four hydrogen atoms to form CH4. The one valence electron leaves sodium and adds to the seven valence electrons of chlorine to form the ionic formula unit NaCl (Figure 1a). Transition metals do not normally bond in this fashion. They primarily form coordinate covalent bonds, a...

Ionic Compounds: Formulas and Nomenclature

Ionic Compounds: Formulas and Nomenclature

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Drug Nomenclature

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During the development of a new pharmaceutical, the manufacturer initially assigns a code name to the drug. Once approved, the drug receives a United States Adopted Name (USAN)—a generic, nonproprietary designation. Upon being listed in the United States Pharmacopeia, this nonproprietary name becomes the drug's official name. Additionally, the manufacturer assigns a proprietary name or trademark, which serves as the brand name under which the drug is marketed. It is worth noting that...

Nomenclature of Alkenes

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The IUPAC naming system for alkenes replaces -an- with -en- in the corresponding parent alkanes. Accordingly, a simple alkene replaces the -ane suffix of the alkane with -ene.
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In the late 19th-century, the number of new chemical compounds discovered increased tremendously. Hence, the necessity arose to develop a naming system for the systematic nomenclature of these newly discovered compounds. IUPAC (International Union for Pure and Applied Chemistry), established in 1919, sets rules for the nomenclature.
The alkane nomenclature considers the length of the carbon chain, the number, and the location of the substituent to arrive at its systematic name. The IUPAC...

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Related Experiment Video

Updated: Feb 11, 2026

A Highly Scalable Approach to Perform Ecological Surveys of Selfing Caenorhabditis Nematodes

A Highly Scalable Approach to Perform Ecological Surveys of Selfing Caenorhabditis Nematodes

Published on: March 1, 2022

Caenorhabditis nomenclature.

Mary Ann Tuli¹, Aric Daul², Tim Schedl³

¹Biology Division, California Institute of Technology, Pasadena CA 91125, USA.

Wormbook : the Online Review of C. Elegans Biology

|May 4, 2018

Summary

WormBase oversees genetic nomenclature for nematodes, including C. elegans. This system relies on collaboration with the Caenorhabditis Genetics Center (CGC) and the scientific community.

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Last Updated: Feb 11, 2026

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Published on: October 18, 2017

Area of Science:

Nematode genetics and genomics
Bioinformatics and database management

Background:

Accurate genetic nomenclature is crucial for reproducible research in nematode biology.
Standardized naming conventions facilitate data sharing and interpretation across studies.

Purpose of the Study:

To describe the established system for genetic nomenclature in Caenorhabditis and related nematode species.
To highlight the collaborative efforts involved in maintaining this nomenclature system.

Main Methods:

Supervision by WormBase, a central bioinformatics resource.
Collaboration with the Caenorhabditis Genetics Center (CGC) for curation and distribution.
Integration of community feedback from researchers worldwide.

Main Results:

A robust and community-supported system for nematode genetic nomenclature is in place.
WormBase and CGC serve as key hubs for nomenclature management.
Ongoing community input ensures the system's relevance and accuracy.

Conclusions:

The collaborative model ensures the integrity and utility of genetic nomenclature for nematode research.
This system supports the advancement of C. elegans and broader nematode biology studies.
Continued community engagement is vital for the future of nematode genetic nomenclature.