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

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For much more information on the Visual aspects image check out the Uses and properties section below.

Discovery day 1802
uncovered by Anders Gustav Ekeberg
beginning of the name The name is acquired from the legendary Greek number King Tantalus.


GroupA vertical shaft in the routine table. Members of a group typically have similar properties and also electron configuration in their outer shell.

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

BlockElements room organised right into blocks by the orbital form in i m sorry the external electrons space found. This blocks are called for the properties spectra castle produce: sharp (s), major (p), diffuse (d), and basic (f).

Atomic numberThe variety of protons in one atom.

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

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

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

SublimationThe transition of a substance straight from the solid come the gas phase without passing v a fluid phase.

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

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

IsotopesAtoms the the same facet with various numbers the neutrons.

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CAS numberThe chemical Abstracts business registry number is a distinctive identifier of a specific chemical, design to stop confusion occurring from various languages and also naming systems.