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Glossary

allotrope Some aspects exist in several various structural forms, called allotropes. Each allotrop has various physical properties.

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For much more information on the Visual facets image watch the Uses and properties section below.


Discovery date 1811
uncovered by bernard Courtois
origin of the name The name is acquired from the Greek "iodes" definition violet.
Allotropes I2

Glossary

GroupA vertical obelisk in the regular table. Members the a group generally have similar properties and also electron configurations in their external shell.

PeriodA horizontal row in the routine table. The atomic variety of each element increases by one, analysis from left to right.

BlockElements are organised into blocks through the orbital form in which the external electrons room found. These blocks are named for the characteristic spectra lock produce: spicy (s), major (p), diffuse (d), and basic (f).

Atomic numberThe number of protons in one atom.

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

Melting pointThe temperature in ~ which the solid–liquid phase change occurs.

Boiling point The temperature in ~ which the lpg phase adjust occurs.

SublimationThe shift of a substance directly from the solid to the gas phase without passing v a liquid phase.

Density (g cm−3)Density is the fixed of a problem that would certainly fill 1 cm3 in ~ room temperature.

Relative atomic massThe mass of one atom relative to that of carbon-12. This is around the sum of the number of protons and neutrons in the nucleus. Where more than one isotope exists, the value provided is the abundance load average.

IsotopesAtoms that the same facet with various numbers that neutrons.

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CAS numberThe chemistry Abstracts service registry number is a distinct identifier of a details chemical, design to avoid confusion developing from different languages and also naming systems.