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

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For much more information top top the Visual facets image see the Uses and also properties ar below.

Discovery day 1898
discovered by sir William Ramsay and Morris Travers
beginning of the name The name is derived from the Greek "kryptos", meaning hidden.


GroupA vertical column in the periodic table. Members the a group frequently have comparable properties and electron configurations in their outer shell.

PeriodA horizontal row in the periodic table. The atomic variety of each element increases by one, analysis from left to right.

BlockElements room organised into blocks by the orbital type in i m sorry the external electrons space found. These blocks are named for the characteristic spectra castle produce: spicy (s), primary (p), diffuse (d), and basic (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 liquid phase adjust occurs.

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

SublimationThe transition of a substance directly from the solid to the gas phase without passing through a liquid phase.

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

Relative atom massThe massive of one atom loved one to the of carbon-12. This is approximately the amount of the variety of protons and neutrons in the nucleus. Where an ext than one isotope exists, the value provided is the abundance load average.

IsotopesAtoms the the same facet with different numbers that neutrons.

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CAS numberThe chemical Abstracts service registry number is a distinct identifier that a certain chemical, design to prevent confusion arising from various languages and naming systems.