I-helium
Ingxenye 2 · 4.0026 u
I-helium iyingxenye yesithathu ekhanyayo futhi yesibili eminingi ekhona emhlabeni obonakalayo.
Izici Zobuchopho
| I-Atom Mass | 4.0026 u |
| Ubukhulu | 0.0001785 g/cm³ |
| Izinga lokuncibilika | 0.95 K |
| Izinga lokubopha | 4.22 K |
| Ukubonakala | Igesi elingumthunzi |
| Isimo ku-Room Temp | Igesi |
Izici ze-chemical
| I-Ionization Energy | 2372.3 kJ/mol |
| I-electron affinity | -48.0 kJ/mol |
| I-Oxidation States | 0 |
Izici ze-Atom
| I-electron | 1s2 |
| I-Atom Radius | 31.0 pm |
| I-Covalent Radius | 28.0 pm |
| I-Van der Waals Radius | 140.0 pm |
Ukuqapha
| Itholakele ngu | Pierre Janssen, Joseph Norman Lockyer |
| Unyaka wokuqamba | 1868 |
| Indawo | Guntur, India / London, England |
| Ibizwa nge | isiGreki 'helios' isho ilanga |
Malunga I-helium
I-helium iyigesi engambalanga, engaphunganga, engasebenziyo ye-monatomic ephethe i-noble gas series. I-helium inezinga eliphansi lokugqwala kwazo zonke izinto ku-4.22 K futhi ingafakwa ngaphansi kocindezelo kuphela. I-helium itholakala emhlabeni nge-radioactive alpha decay yezinto ezinzima. Yatholakaliswa kuqala nge-spectroscopically elanga ngaphambi kokuba itholakale emhlabeni.
Izisebenziso
I-Cryogenics, i-MRI machines, amabhaloni eqembu, amagesi axhunywe eduze kwe-sea diving, ukuqapha ukuchithwa, kanye nokukhiqizwa kwe-semiconductor.
Iqiniso elijabulisayo
I-helium iyingxenye eyodwa kuphela etholakele ezindaweni ezingaphandle ngaphambi kokuba itholakale emhlabeni, yatholakala kuqala esigabeni selanga ngesikhathi sokukhanya kwelanga ngo-1868.
Isibonisi
| Inani le-mass | Ubukhulu | Isikhathi esingu-half-life | Iqinile |
| 3 | 0.00000134% | - | Yebo |
| 4 | 0.99999866% | - | Yebo |
I-electron
1s2