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regular Table

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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 an ext information top top the Visual aspects image see the Uses and also properties section below.

Discovery day 1808
discovered by Louis-Josef Gay-Lussac and also Louis-Jacques Thénard in Paris, France, and Humphry Davy in London, UK
origin of the name The surname is derived from the Arabic "buraq", which to be the name for borax.
Allotropes α-rhombohedral B, β-rhombohedral B, γ-B, tetragonal boron


GroupA vertical obelisk in the regular table. Members of a group commonly have similar properties and electron configurations in their external shell.

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

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

Atomic numberThe number of protons in an atom.

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

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

Boiling point The temperature at which the liquid gas phase adjust occurs.

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

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

Relative atom massThe massive of one atom family member to that of carbon-12. This is approximately the sum of the number of protons and also neutrons in the nucleus. Where much more than one isotope exists, the value given is the abundance load average.

IsotopesAtoms that the same aspect with various numbers of neutrons.

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CAS numberThe chemistry Abstracts service registry number is a distinct identifier of a details chemical, designed to protect against confusion developing from various languages and also naming systems.