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regular Table

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

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For much more information top top the Visual elements image check out the Uses and also properties section below.

Discovery date 1825
discovered by Hans Oersted
beginning of the name The surname is acquired from the Latin surname for alum, "alumen" an interpretation bitter salt.


GroupA vertical pillar in the regular table. Members that a group typically have comparable properties and electron construction in their outer shell.

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

BlockElements space organised right into blocks by the orbital form in i beg your pardon the external electrons room found. This blocks are called for the characteristics spectra they produce: spicy (s), principal (p), diffuse (d), and an essential (f).

Atomic numberThe number of protons in one atom.

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

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

Boiling point The temperature at which the liquid gas phase readjust occurs.

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

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

Relative atomic massThe massive of one atom family member to that of carbon-12. This is around 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 load average.

IsotopesAtoms that the same facet with various numbers of neutrons.

See more: Which Of The Following Is A Secondary Alkyl Halide? ?(1) Organic Chemistry

CAS numberThe chemistry Abstracts company registry number is a distinctive identifier of a particular chemical, draft to protect against confusion emerging from different languages and also naming systems.