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

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For more information top top the Visual elements image view the Uses and properties section below.

Discovery day 1937
uncovered by Carlo Perrier and also Emilio Segrè
origin of the name The surname is obtained from the Greek "tekhnetos" an interpretation artificial.


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

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

BlockElements room organised right into blocks through the orbital kind in i m sorry the external electrons are found. This blocks are named for the characteristics spectra castle produce: sharp (s), primary (p), diffusive (d), and fundamental (f).

Atomic numberThe variety of protons in one atom.

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

Melting pointThe temperature in ~ which the solid liquid phase readjust occurs.

Boiling point The temperature in ~ which the lpg phase change occurs.

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

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

Relative atom massThe fixed of an atom family member to that 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 provided is the abundance weight average.

IsotopesAtoms the the same aspect with various numbers of neutrons.

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CAS numberThe chemistry Abstracts service registry number is a unique identifier that a specific chemical, design to prevent confusion arising from various languages and also naming systems.