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An element is a substance composed of atoms with identical atomic number . The older definition of element (an element is a pure substance that can't be decomposed chemically) was made obsolete by the discovery of isotopes .

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Κλάδος/Τομέας: Chemistry
Category: General chemistry
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Chemistry; General chemistry

A compound that consists of only carbon and hydrogen, that contains at least one carbon-carbon double bond. Alkene names end with -ene. Examples are ethylene (CH2=CH2); 1-propene ...

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Chemistry; General chemistry

A colloid formed from tiny liquid droplets suspended in another, immiscible liquid. Milk is an example of an emulsion.

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Chemistry; General chemistry

An elementary particle produced by certain nuclear decay processes. Neutrinos have no charge and extremely small masses compared to other subatomic particles.

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Chemistry; General chemistry

A device that senses temperature changes by using a pair of joined wires made of dissimilar metals that produces a voltage that changes with temperature.

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An insulated vessel for measuring the amount of heat absorbed or released by a chemical or physical change.

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Chemistry; General chemistry

1. An -OH group within a molecule. 2. A free radical formed by abstraction of a hydrogen atom from water.

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Κλάδος/Τομέας: Holiday Category: Festivals

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The most important of the traditional Chinese holidays, Chinese New Year represents the official start of the spring, beginning on the first day of ...