Helium – Wikipedia
WEBHelium on alkuaine, joka on väritön ja hajuton jalokaasu. Se on tunnetun maailmankaikkeuden toiseksi yleisin alkuaine vedyn jälkeen, ja sitä on maailmankaikkeuden tunnetusta massasta noin neljäsosa. Sen kemiallinen merkki …
Helium - Wikipedia
WEBHelium (from Greek: ἥλιος, romanized: helios, lit. 'sun') is a chemical element; it has symbol He and atomic number 2. It is a colorless, odorless, tasteless, non-toxic, inert, monatomic gas and the first in the noble gas group in the periodic table.
Helium - Element information, properties and uses | Periodic Table
WEBAfter hydrogen, helium is the second most abundant element in the universe. It is present in all stars. It was, and is still being, formed from alpha-particle decay of radioactive elements in the Earth. Some of the helium formed escapes into the atmosphere, which contains about 5 parts per million by volume.
Helium | Definition, Properties, Uses, & Facts | Britannica
WEBHelium, chemical element, inert gas of Group 18 (noble gases) of the periodic table. The second lightest element, helium is a colorless, odorless, and tasteless gas that becomes liquid at -268.9 degrees Celsius. The boiling and freezing points of helium are lower than those of any other known substance.
Helium - Simple English Wikipedia, the free encyclopedia
WEBHelium is a chemical element. It has the chemical symbol He , atomic number 2, and atomic weight of about 4.002602. There are 9 isotopes of helium, only two of which are stable.
Helium - Wikiwand
WEBHelium (from Greek: ἥλιος, romanized: helios, lit. 'sun') is a chemical element; it has symbol He and atomic number 2. It is a colorless, odorless, tasteless, non-toxic, inert, monatomic gas and the first in the noble gas group in the periodic table.
helium summary | Britannica
WEBA noble gas, it is colourless, odourless, tasteless, completely unreactive, and nontoxic. First found by spectroscopy of the Sun’s atmosphere in 1868, it is the second most abundant and second-lightest element in the universe (after hydrogen).
Helium (He) - Elements: The Periodic Table
WEBHelium is the 2nd element in the periodic table and has a symbol of He and atomic number of 2. It has an atomic weight of 4.00260 and a mass number of 4. Helium has two protons and two neutrons in its nucleus, and two electrons in one shell.
Facts About Helium | Live Science
WEBJan 27, 2015 · Helium is a noble gas, a group of nonreactive and stable gases that also include neon, argon, krypton, xenon and radon. As of 2010, it took 300,000 cubic feet of helium to float the 15...
Elements in focus: helium – Science in School
WEBJun 15, 2021 · Helium is the second most common element in the Universe; it was formed during the Big Bang and there is lots in stars, which release energy by fusing hydrogen atoms to give helium. However, Earth’s helium is …