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

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For much more information on the Visual elements image check out the Uses and properties ar below.

Discovery date 1807
discovered by Humphry Davy
origin of the name The name is derived from the English word "soda".


GroupA vertical tower in the periodic table. Members the a group typically have similar properties and also electron configurations in their external shell.

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

BlockElements are organised into blocks by the orbital form in which the external electrons space found. These blocks are called for the characteristics spectra castle produce: spicy (s), major (p), diffuse (d), and fundamental (f).

Atomic numberThe number of protons in an atom.

Electron configurationThe arrangements of electrons over the critical (closed shell) noble gas.

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

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

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

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

Relative atomic massThe mass of an atom relative to the of carbon-12. This is around the amount of the variety 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 aspect with various numbers the neutrons.

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CAS numberThe chemical Abstracts organization registry number is a distinctive identifier of a particular chemical, draft to avoid confusion emerging from different languages and naming systems.