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Glossary

allotrope Some facets exist in several different structural forms, referred to as allotropes. Each allotrope has different physical properties.

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For much more information ~ above the Visual aspects image see the Uses and properties section below.


Discovery day 1894
uncovered by mr Rayleigh and also Sir william Ramsay
beginning of the name The name is acquired from the Greek, "argos", definition idle.
Allotropes -

Glossary

GroupA vertical tower in the periodic table. Members of a group commonly have comparable properties and also electron configuration in their external shell.

PeriodA horizontal heat in the regular table. The atomic variety of each facet increases by one, reading from left come right.

BlockElements room organised into blocks through the orbital type in which the outer electrons are found. This blocks are named for the properties spectra castle produce: spicy (s), major (p), diffuse (d), and basic (f).

Atomic numberThe number of protons in an atom.

Electron configurationThe kinds of electrons over the last (closed shell) noble gas.

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

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

SublimationThe transition of a substance directly from the solid come the gas step without passing with a liquid phase.

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

Relative atom massThe fixed of an atom loved one to the of carbon-12. This is around the sum of the variety of protons and neutrons in the nucleus. Where much more than one isotope exists, the value given is the abundance weight average.

IsotopesAtoms of the same aspect with different numbers that neutrons.

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CAS numberThe chemistry Abstracts company registry number is a distinctive identifier of a details chemical, draft to prevent confusion emerging from various languages and naming systems.