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routine Table

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

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For much more information on the Visual elements image see the Uses and also properties section below.

Discovery date 1783
uncovered by Juan and Fausto Elhuyar
beginning of the name The surname is acquired from the sweden "tung sten" an interpretation heavy stone.


GroupA vertical shaft in the routine table. Members the a group frequently have comparable properties and electron configuration in their external shell.

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

BlockElements space organised right into blocks through the orbital type in which the external electrons room found. These blocks are named for the characteristic spectra lock produce: spicy (s), major (p), diffuse (d), and basic (f).

Atomic numberThe number of protons in one 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 readjust occurs.

SublimationThe shift 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 in ~ room temperature.

Relative atom massThe fixed of an atom loved one to the of carbon-12. This is about the amount of the number of protons and also neutrons in the nucleus. Where more than one isotope exists, the value offered is the abundance weight average.

IsotopesAtoms the the same element with different numbers of neutrons.

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CAS numberThe chemistry Abstracts company registry number is a distinct identifier the a particular chemical, design to protect against confusion arising from different languages and also naming systems.