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regular Table

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

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

Discovery date 1807
discovered by Humphry Davy
beginning of the name The surname is acquired from the English indigenous "potash".


GroupA vertical shaft in the regular table. Members of a group commonly have comparable properties and electron configuration in their outer shell.

PeriodA horizontal row in the routine table. The atomic variety of each element increases through one, reading from left come right.

BlockElements are organised right into blocks through the orbital form in i m sorry the external electrons space found. This blocks are named for the characteristics spectra lock produce: sharp (s), major (p), diffuse (d), and an essential (f).

Atomic numberThe number of protons in an atom.

Electron configurationThe arrangements of electrons above the last (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 straight from the solid come the gas phase without passing with a liquid phase.

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

Relative atom massThe fixed of an atom relative to that of carbon-12. This is roughly the sum of the variety of protons and also neutrons in the nucleus. Where an ext than one isotope exists, the value given is the abundance weighted average.

IsotopesAtoms the the same facet with different numbers that neutrons.

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CAS numberThe chemical Abstracts company registry number is a distinct identifier the a specific chemical, design to avoid confusion developing from different languages and also naming systems.