Helium (He)

General Properties

Symbol He
Atomic Number 2
Atomic Weight 4.002602
Group
18 (noble gases or helium family/neon family)
VIII (IUPAC), VIIIA (CAS)
Gas, Diamagnetic, Noble Gas, Nonmetal, Stable, Natural
Period 1
Block s

Physical Properties

Density 0.0001785 g/cm3
Atomic Volume 31.8 cm3/mole
Atomic Radius --
Covalent Radius 32 pm
Crust Abundance 5.5E-7%
Crystal Structure Hexagonal
Color Colorless

Energy

Electronegativity (Pauling Scale)
Electron Affinity 0 kJ/mol
1st Ionization Energy 2377 kJ/mol
2nd Ionization Energy 5250.5 kJ/mol
Specific Heat Capacity 5.193 J g−1 K−1
Thermal Conductivity 0.152 W·m−1·K−1

Electrons & Oxidation

Oxidation States 0
Electrons Per Shell 2
Electron Configuration 1s2
Orbital Diagram
1s
↿⇂

Nuclear

Radioactive No

Media

Planetary Bohr Model of Helium (He)
Lewis Dot Diagram of Helium (He)
Description
Light, odorless, colorless, tasteless inert gas. Second most abundant element in the universe. Sixth most abundant in the earth's atmosphere.
Uses
Used in balloons, deep sea diving & welding. Also used in very low temperature research.
Sources
Found in natural gas deposits & in the air (5 parts per billion) Constantly lost to space; replenished by radioactive decay (alpha particles).
Pronounciation (English)
HEE-li-em

Translations

Afrikaans Helium
Aragonese Elio
العربية هيليوم
Armãneashte Heliumu
asturianu Heliu
azərbaycan dili Helium
български Хелий
বাংলা হিলিয়াম
brezhoneg Heliom
bosanski Helij[um]
Byelorussian Гелій
Cebuano Helio
čeština Helium
Chuvash Гели
Cymraeg Heli
dansk Helium
Deutsch Helium
Ελληνικά Ήλιον
English Helium
esperanto Helio
español Hélio
eesti Heelium
euskara Helioa
فارسی هلیم
suomi Helium
føroyskt Helium
français Hélium
furlan Eli
West-Frysk Helium
Gaeilge Héiliam
Gàidhlig Hèiliam
galego Helio
ગુજરાતી હીલિયમ
Gaelg Hailium
Hakka Chinese Hoi (氦)
עברית הליום
हिन्दी हिलियम
hrvatski Helij
magyar Hélium
հայերեն Հելիում
Indonesia Helium
íslenska Helín
italiano Elio
日本語 ヘリウム
ქართული ჰელიუმი
کٲشُر Él
қазақ тілі Гелий
한국어 헬륨
Kurdish Hêlyûm
Komi Гелий
kernewek Helyum
кыргызча Гелий
Latin Helium
Lëtzebuergesch Helium
Lombard Éli
lingála Eliyúmu
lietuvių Helis
latviešu Hēlijs
Mari Гелий
Maori Haumāmā
македонски Хелиум
മലയാളം ഹീലിയം
монгол Гели
Мокшан Гели
Bahasa Melayu Helium
Malti Ħiljum, ²Elju
Nahuatl Tōnatiuyoh
Nederlands Helium
norsk Helium
Occitan Eli
ирон Гелий
polski Hel
português Hélio
Runasimi Ilyu
română Heliu
русский Гелий
slovenčina Hélium
slovenščina Helij
Samoan Helimi
Samogitian Helis
shqip Helium
српски Хелијум
Southern Sotho Heliamo
svenska Helium
Kiswahili Heli
தமிழ் ஹீலியம்
Tajik Гелий
ไทย ฮีเลียม
Türkçe Helyum
ئۇيغۇرچە گېلىي
українська Гелій
o‘zbek Geliy
Tiếng Việt Heli
Võro Heelium
中文

History

Discovered In
1895
Discovered By
William Ramsay
Discovered At
London, England
Word Origin
From the Greek word "helios" meaning "sun"