10
Ne
20.1797
Neon
engelsk: Neon
Ædelgasser
Gruppe 18
Periode 2
Blok p
Gas
Neon er et kemisk grundstof i det periodiske system med kemisk symbol Ne og atomnummer 10 med en atomvægt på 20.1797 u og er klassificeret som ædelgasser og er en del af gruppen 18 (ædelgasser). Neon er gas ved stuetemperatur.
Neon i det periodiske system
| Symbol | Ne |
| Atomnummer | 10 |
| Gruppe | 18 (Ædelgasser) |
| Periode | 2 |
| Blok | p |
| Klassifikation | Ædelgasser |
| Udseende | Colorless gas exhibiting an orange-red glow when placed in a high voltage electric field |
| Farve | Farveløs |
| Antal protoner | 10 p+ |
| Antal neutroner | 10 n0 |
| Antal elektroner | 10 e- |
Fra Wikipedia, den gratis encyklopædiNeon (af græsk νέον, neon, "ny") er det 10. grundstof i det periodiske system, og har det kemiske symbol Ne. Under normale tryk- og temperaturforhold optræder denne ædelgas som en farve-, lugt- og smagsløs gas. Neon blev opdaget i 1898 af William Ramsay og Morris William Travers.
Fysiske egenskaber
| Fase ved STP | Gas |
| Massefylde | 0.9002 g/cm3 |
| Atommasse | 20.1797 u |
Thermal properties
| Smeltepunkt | 24.56 K -248.59 °C -415.462 °F |
| Kogepunkt | 27.104 K -246.046 °C -410.8828 °F |
| Fordampningsvarme | 1.77 kJ/mol |
Atomiske egenskaber
| Elektronegativitet (Pauling Scale) | - |
| Elektronaffinitet | -116 kJ/mol |
| Oxidationstrin | 0 |
| Ioniseringsenergier |
|
Elektronkonfiguration for neon
Elektronkonfiguration Kortfattet konfiguration | [He] 2s2 2p6 | ||||||||
| Fuld konfiguration | 1s2 2s2 2p6 | ||||||||
Elektronkonfigurationsdiagram |
| ||||||||
| Elektroner pr. Skal | 2, 8 | ||||||||
| Valenselektroner | 8 | ||||||||
| Valency-elektroner | 0 | ||||||||
| Bohrs atommodel | Figur: Skaldiagram af Neon (Ne) atom. | ||||||||
Orbital diagram |
|
The history of Neon
| Forudsigelse | William Ramsay (1897) |
| Opdagelse og første isolation | William Ramsay, Morris Travers (1898) |
Opdagelse af neon Neon was discovered in 1898 by the British chemists Sir William Ramsay (1852–1916) and Morris Travers (1872–1961) in London. Neon was discovered when Ramsay chilled a sample of air until it became a liquid, then warmed the liquid and captured the gases as they boiled off. The gases nitrogen, oxygen, and argon had been identified, but the remaining gases were isolated in roughly their order of abundance, in a six-week period beginning at the end of May 1898. First to be identified was krypton. The next, after krypton had been removed, was a gas which gave a brilliant red light under spectroscopic discharge. This gas, identified in June, was named "neon", the Greek analogue of the Latin novum ('new') suggested by Ramsay's son. The characteristic brilliant red-orange color emitted by gaseous neon when excited electrically was noted immediately. Travers later wrote: "the blaze of crimson light from the tube told its own story and was a sight to dwell upon and never forget." | |
| Original word | neos |
| Language of origin | Greek |
| Name source | Egenskaber |
| Meaning | “New” |
Naming The name is derived from the Greek word, νέον, neuter singular form of νέος (neos), meaning 'new'. | |