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periodic Table

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allotrope Some facets exist in several various structural forms, dubbed allotropes. Each allotrope has various physical properties.

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For more information top top the Visual facets image watch the Uses and properties ar below.

Discovery date 1899
uncovered by Andrew Debierne
origin of the name The name is obtained from the Greek "actinos", definition a ray.


GroupA vertical tower in the routine table. Members that a group generally have similar properties and also electron configurations in their external shell.

PeriodA horizontal row in the periodic table. The atomic number of each element increases by one, reading from left to right.

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

Atomic numberThe number of protons in one atom.

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

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

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

SublimationThe shift of a substance straight from the solid come the gas step without passing with 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 family member to the of carbon-12. This is around the amount of the number of protons and neutrons in the nucleus. Where an ext than one isotope exists, the value given is the abundance weighted average.

IsotopesAtoms that the same element with different numbers that neutrons.

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