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regular Table

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

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For an ext information top top the Visual facets image see the Uses and properties ar below.

Discovery day 1807
discovered by Humphry Davy
beginning of the name The surname is derived from the English word "potash".


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

PeriodA horizontal heat in the periodic table. The atomic number of each facet increases through one, analysis from left come right.

BlockElements space organised right into blocks by the orbital form in which the external electrons are found. This blocks are named for the characteristic spectra castle produce: spicy (s), major (p), diffusive (d), and fundamental (f).

Atomic numberThe variety of protons in an atom.

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

Melting pointThe temperature at which the solid liquid phase adjust occurs.

Boiling point The temperature in ~ which the liquid–gas phase change occurs.

SublimationThe transition of a substance straight from the solid come the gas step without passing through 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 massive of an atom loved one to the of carbon-12. This is around the sum of the number of protons and also neutrons in the nucleus. Where much more than one isotope exists, the value provided is the abundance weight average.

IsotopesAtoms of the same aspect with different numbers of neutrons.

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CAS numberThe chemical Abstracts business registry number is a unique identifier the a certain chemical, designed to prevent confusion emerging from different languages and naming systems.