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Glossary

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

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For more information on the Visual aspects image see the Uses and also properties ar below.


Discovery date 1875
uncovered by Paul-Émile Lecoq de Boisbaudran
origin of the name The surname is derived from the Latin name for France, "Gallia"
Allotropes

Glossary

GroupA vertical shaft in the regular table. Members the a group generally have similar properties and electron construction in their external shell.

PeriodA horizontal heat in the routine table. The atomic variety of each element increases through one, reading from left come right.

BlockElements are organised into blocks by the orbital type in i beg your pardon the outer electrons space found. This blocks are called for the characteristic spectra they produce: sharp (s), primary (p), diffusive (d), and an essential (f).

Atomic numberThe variety of protons in an atom.

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

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

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

SublimationThe transition of a substance straight from the solid to the gas step without passing v a liquid phase.

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

Relative atom massThe fixed of one atom relative to the of carbon-12. This is about the sum of the variety of protons and neutrons in the nucleus. Where more than one isotope exists, the value given is the abundance weighted average.

IsotopesAtoms that the same aspect with various numbers that neutrons.

See more: What Is An Oasis And Why Is It Important, Which Value Does It Support

CAS numberThe chemistry Abstracts service registry number is a unique identifier of a certain chemical, draft to protect against confusion arising from various languages and naming systems.