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

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For an ext information top top the Visual facets image check out the Uses and also properties section below.

Discovery day 1898
uncovered by sir William Ramsay and also Morris Travers
origin of the name The name is obtained from the Greek "kryptos", definition hidden.


GroupA vertical obelisk in the routine table. Members that a group typically have comparable properties and electron configuration in their external shell.

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

BlockElements are organised right into blocks by the orbital form in i m sorry the external electrons room found. These blocks are named for the characteristic spectra lock produce: sharp (s), primary (p), diffusive (d), and fundamental (f).

Atomic numberThe variety of protons in one atom.

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

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

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

SublimationThe transition of a substance straight 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 certainly fill 1 cm3 in ~ room temperature.

Relative atomic massThe massive of an atom relative to the of carbon-12. This is roughly the amount of the variety of protons and neutrons in the nucleus. Where an ext than one isotope exists, the value offered is the abundance weighted average.

IsotopesAtoms the the same facet with various numbers the neutrons.

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CAS numberThe chemical Abstracts service registry number is a distinctive identifier of a certain chemical, design to stop confusion developing from different languages and also naming systems.