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Periodic Table
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Glossary

Allotropes Some elements exist in several various structural develops, called allotropes. Each allotrope has actually various physical properties.

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For even more indevelopment on the Visual Elements photo see the Uses and properties section below.


Discoexceptionally date 1898
Disspanned by Sir William Ramsay and Morris Travers
Origin of the name The name originates from the Greek "neos", interpretation brand-new.
Allotropes

Glossary

GroupA vertical column in the periodic table. Members of a group frequently have equivalent properties and electron configurations in their external shell.

PeriodA horizontal row in the routine table. The atomic number of each facet rises by one, reading from left to right.

BlockElements are organised into blocks by the orbital kind in which the outer electrons are found. These blocks are called for the characteristic spectra they produce: sharp (s), major (p), diffusage (d), and basic (f).

Atomic numberThe variety of prolots in an atom.

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

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

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

SublimationThe change of a substance directly from the solid to the gas phase without passing with a liquid phase.

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

Relative atomic massThe mass of an atom loved one to that of carbon-12. This is about the sum of the number of prolots and also neutrons in the nucleus. Wright here even more than one isotope exists, the value provided is the abundance weighted average.

IsotopesAtoms of the same aspect through various numbers of neutrons.

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CAS numberThe Chemical Abstracts Service regisattempt number is a distinctive identifier of a specific chemical, designed to prevent confusion emerging from various langueras and also naming units.