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Glossary

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

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For much more information top top the Visual elements image see the Uses and also properties ar below.


Discovery day 1824
found by Jöns Jacob Berzelius
origin of the name The name is obtained from the Latin "silex" or "silicis", an interpretation flint.
Allotropes amorphous Si, crystalline Si

Glossary

GroupA vertical column in the regular table. Members that a group typically have comparable properties and also electron configuration in their external shell.

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

BlockElements are organised right into blocks by the orbital kind in i beg your pardon the outer electrons room found. These blocks are called for the characteristics spectra they produce: sharp (s), primary (p), diffuse (d), and fundamental (f).

Atomic numberThe number of protons in one atom.

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

Melting pointThe temperature at which the solid-fluid phase adjust occurs.

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

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

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

Relative atomic massThe mass of an atom family member to the of carbon-12. This is roughly the amount of the number of protons and neutrons in the nucleus. Where much more than one isotope exists, the value given is the abundance weighted average.

IsotopesAtoms the the same facet with different numbers that neutrons.

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CAS numberThe chemistry Abstracts business registry number is a distinctive identifier the a particular chemical, draft to protect against confusion arising from various languages and also naming systems.