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periodic Table

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

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For much more information top top the Visual aspects image watch the Uses and properties section below.

Discovery date 1861
found by Gustav Kirchhoff and Robert Bunsen
origin of the name The name is derived kind the Latin "rubidius", meaning deepest red.


GroupA vertical tower in the periodic table. Members that a group typically have comparable properties and also electron configurations in their external shell.

PeriodA horizontal heat in the periodic table. The atomic variety of each aspect increases by one, analysis from left to right.

BlockElements are organised right into blocks by the orbital type in i beg your pardon the outer electrons are found. These blocks are named for the characteristic spectra they produce: spicy (s), principal (p), diffusive (d), and an essential (f).

Atomic numberThe variety of protons in one atom.

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

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

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

SublimationThe shift of a substance straight from the solid come the gas step without passing v a fluid phase.

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

Relative atomic massThe massive of an atom relative to the of carbon-12. This is about the sum of the variety of protons and also neutrons in the nucleus. Where an ext than one isotope exists, the value given is the abundance weight average.

IsotopesAtoms the the same element with different numbers of neutrons.

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CAS numberThe chemistry Abstracts business registry number is a unique identifier that a certain chemical, designed to protect against confusion arising from various languages and also naming systems.