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Helium is a colorless, odorless, non-toxic, and inert gas that is the second most abundant element in the universe. It is also the first element to be isolated and identified as a noble gas, and has various applications in science, industry, and medicine.
Το ήλιο (helium) είναι το χημικό στοιχείο με ατομικό αριθμό 2 και ατομική μάζα 4,002602 amu. Αντιπροσωπεύεται από το σύμβολο He. Στις κανονικές συνθήκες περιβάλλοντος, είναι άχρωμο, άοσμο, άγευστο, μη τοξικό, ιδανικό, μονοατομικό αέριο, που είναι επικεφαλής (πρώτο) των ευγενών αερίων του Περιοδικού Συστήματος των Χημικών στοιχείων.
Helium is a colourless, odourless gas that is totally unreactive and has many applications in science and industry. It is the second most abundant element in the universe and was first detected in the sun's corona by its spectral lines.
25 Οκτ 2024 · Helium is a colourless, odourless, and tasteless gas that becomes liquid at −268.9 °C and is the second lightest element. It was discovered in the Sun's spectrum and on Earth by radioactive decay, and has two stable isotopes: helium-3 and helium-4.
Helium is a colorless, odorless, nonmetallic gas with the symbol He and atomic number 2. It has the lowest boiling point of all elements and is chemically inert. Learn more about its physical, chemical, and thermodynamic properties, as well as its crystal structure, classification, and quantum numbers.
2 Σεπ 2021 · Learn about helium, the second element on the periodic table, with the symbol He and atomic number 2. Find out its discovery, isotopes, uses, sources, compounds, and more.
Helium is a chemical element with symbol He and atomic number 2. Classified as a noble gas, Helium is a gas at room temperature.
