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routine Table

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

You are watching: In a sample of the element potassium, each atom has

For an ext information ~ above the Visual aspects image check out the Uses and properties section below.

Discovery date 1807
discovered by Humphry Davy
beginning of the name The name is acquired from the English native "potash".


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

PeriodA horizontal row in the periodic table. The atomic number of each element increases through one, analysis from left come right.

BlockElements room organised right into blocks by the orbital kind in i m sorry the external electrons are found. These blocks are named for the properties spectra castle produce: spicy (s), major (p), diffuse (d), and an essential (f).

Atomic numberThe variety of protons in an 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 at which the liquid gas phase adjust occurs.

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

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

Relative atomic massThe mass of an atom loved one to that of carbon-12. This is about the sum of the number of protons and also neutrons in the nucleus. Where more than one isotope exists, the value given is the abundance weighted average.

IsotopesAtoms of the same facet with various numbers the neutrons.

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CAS numberThe chemistry Abstracts business registry number is a distinct identifier that a particular chemical, draft to avoid confusion occurring from different languages and naming systems.