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periodic Table

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allotrope Some facets exist in several various structural forms, dubbed allotropes. Each allotrope has various physical properties.

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For more information on the Visual facets image view the Uses and also properties section below.

Discovery day 1774
uncovered by Carl Wilhelm Scheele
origin of the name The name is obtained from the Greek "chloros", definition greenish yellow.
Allotropes Cl2


GroupA vertical pillar in the regular table. Members that a group commonly have similar properties and electron configurations in their outer shell.

PeriodA horizontal heat in the regular table. The atomic variety of each aspect increases by one, reading from left come right.

BlockElements room organised into blocks by the orbital form in i m sorry the external electrons are found. These blocks are called for the properties spectra lock produce: spicy (s), principal (p), diffusive (d), and fundamental (f).

Atomic numberThe variety of protons in one atom.

Electron configurationThe species of electrons above the last (closed shell) noble gas.

Melting pointThe temperature in ~ which the solid-fluid phase readjust occurs.

Boiling point The temperature at which the liquid gas phase change occurs.

SublimationThe shift of a substance directly from the solid come the gas step without passing through a fluid phase.

Density (g cm−3)Density is the mass of a substance that would fill 1 cm3 at room temperature.

Relative atomic massThe fixed of one atom relative to that of carbon-12. This is approximately the amount of the number of protons and neutrons in the nucleus. Where an ext than one isotope exists, the value provided is the abundance weight average.

IsotopesAtoms of the same element with various numbers that neutrons.

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CAS numberThe chemistry Abstracts company registry number is a distinctive identifier that a specific chemical, designed to protect against confusion arising from different languages and also naming systems.