How to clean up New Delhi's smoggy air
An international study led by atmospheric researchers at PSI shows for the first time what portions of particulates in the air over northern India are especially harmful to health.
An international study led by atmospheric researchers at PSI shows for the first time what portions of particulates in the air over northern India are especially harmful to health.
Environment
5 hours ago
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Oil is an important natural resource for many industries, but it can lead to serious environmental damage when accidentally spilled. While large oil spills are highly publicized, every year, there are many smaller-scale spills ...
Environment
Apr 25, 2024
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It is a common hack to stretch a balloon out to make it easier to inflate. When the balloon stretches, the width crosswise shrinks to the size of a string. Noah Stocek, a Ph.D. student collaborating with Western physicist ...
Nanophysics
Apr 17, 2024
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Researchers at ICIQ in Tarragona have developed a simple technique to produce microscopic crystals that activate in the presence of light, releasing silver ions with antimicrobial activity.
Bio & Medicine
Apr 17, 2024
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The total solar eclipse across North America on April 8, 2024, is a stunning and memorable event for everyone in its path. However, eclipses are not just valued for their visual impact, they are at the heart of cutting-edge ...
Astronomy
Apr 9, 2024
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A new automated workflow developed by scientists at Lawrence Berkeley National Laboratory (Berkeley Lab) has the potential to allow researchers to analyze the products of their reaction experiments in real time, a key capability ...
Analytical Chemistry
Apr 8, 2024
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They didn't exist a century ago but today PFAS "forever chemicals" contaminate the environment from groundwater to Antarctic snow to turtle eggs, and concern over their possible toxicity is growing.
Environment
Apr 3, 2024
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DGIST's Physics and Chemistry Professor Park Jin-hee and her research team have developed a technology that allows easy detection of hazardous chemicals. Allowing one to detect harmful substances by analyzing color changes ...
Analytical Chemistry
Mar 29, 2024
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A team of aroma chemists at Friedrich-Alexander-Universität Erlangen-Nürnberg, working with psychologist colleagues from the Technical University of Dresden, has uncovered the reasons for the dissimilar smells between babies ...
Plant-derived essential oils (EOs) find applications in various industries, such as detergents, cosmetics, pharmacology, and food additives. Moreover, EOs have an exceptional safety profile, and their numerous bioactivities ...
Molecular & Computational biology
Mar 21, 2024
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A chemical compound is a pure chemical substance consisting of two or more different chemical elements that can be separated into simpler substances by chemical reactions and that have a unique and defined chemical structure. Chemical compounds consist of a fixed ratio of atoms that are held together in a defined spatial arrangement by chemical bonds. Chemical compounds can be compound molecules held together by covalent bonds, salts held together by ionic bonds, metallic compounds held together by metallic bonds, or complexes held together by coordinate covalent bonds. Substances such as pure chemical elements and elemental molecules consisting of multiple atoms of a single element (such as H2, S8, etc.) are not considered chemical compounds.
Elements form compounds to become more stable. They become stable when they have the maximum number of possible electrons in their outermost energy level, which is normally two or eight valence electrons. This is the reason that noble gases do not frequently react: they already possess eight valence electrons (the exception being helium, which requires only two valence electrons to achieve stability).
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