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Glossary

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

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


Discovery date ancient
uncovered by -
beginning of the name The name originates from the Anglo-Saxon word because that the metal, "lead"
Allotropes

Glossary

GroupA vertical pillar in the periodic table. Members that a group frequently have comparable properties and also electron construction in their external shell.

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

BlockElements are organised into blocks through the orbital form in which the outer electrons are found. This blocks are named for the properties spectra castle produce: sharp (s), primary (p), diffuse (d), and fundamental (f).

Atomic numberThe variety of protons in one atom.

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

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

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

SublimationThe change of a substance directly from the solid to the gas phase without passing v a liquid phase.

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

Relative atom massThe fixed of an atom family member to that of carbon-12. This is roughly the amount of the variety of protons and neutrons in the nucleus. Where much more than one isotope exists, the value offered is the abundance weight average.

IsotopesAtoms the the same element with various numbers that neutrons.

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CAS numberThe chemistry Abstracts service registry number is a unique identifier the a particular chemical, designed to protect against confusion emerging from various languages and also naming systems.