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Glossary

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

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For an ext information top top the Visual facets image check out the Uses and properties ar below.


Discovery day 1766
discovered by Henry Cavendish
origin of the name The surname is derived from the Greek "hydro" and also "genes" meaning water forming.
Allotropes H2

Glossary

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

PeriodA horizontal heat in the routine table. The atomic variety of each aspect increases through one, reading from left to right.

BlockElements room organised right into blocks through the orbital kind in i beg your pardon the external electrons space found. This blocks are named for the characteristic spectra castle produce: spicy (s), principal (p), diffuse (d), and an essential (f).

Atomic numberThe variety of protons in one atom.

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

Melting pointThe temperature at which the solid liquid phase adjust occurs.

Boiling point The temperature in ~ which the liquid gas phase adjust occurs.

SublimationThe transition of a substance directly from the solid to the gas phase without passing through a liquid phase.

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

Relative atomic massThe mass of an atom relative to that of carbon-12. This is approximately 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 weighted average.

IsotopesAtoms that the same aspect with various numbers of neutrons.

See more: How Are S Orbitals Different From P Orbitals Different From P Orbitals?

CAS numberThe chemical Abstracts organization registry number is a distinct identifier of a specific chemical, design to protect against confusion developing from different languages and also naming systems.