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25 Οκτ 2024 · Helium, 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 (from Greek: ἥλιος, romanized: helios, lit. 'sun') is a chemical element; it has symbol He and atomic number 2. It is a colorless, odorless, non-toxic, inert, monatomic gas and the first in the noble gas group in the periodic table.
Helium is a chemical element. Its official symbol is He, and its atomic number is 2, which means it has two protons in its nucleus. Helium was named after Helios – the Greek Titan of the Sun – because it was first observed when analysing sunlight during a solar eclipse in 1868.
After 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.
What is Helium. Helium (pronunciation: HEE-lee-em) is a colorless, odorless element classified as a non-metal, belonging to the group of inert gases in the periodic table and is represented by the chemical symbol He [1, 2, 3].
Introduction. - Helium is the second lightest and second most abundant element in the observable universe. - It plays a vital role in various industries including healthcare, aerospace, and technology. - Helium is a colorless, odorless, and tasteless gas that belongs to the noble gases group in the periodic table. Historical Background.
18 Μαΐ 2015 · Helium is the second lightest and second most abundant element in the universe. Helium mainly occurs in stars and nebulae. On Earth, we extract it from natural gas for use in balloons, cryogenics, breathing mixtures, and fusion research. Basic Helium Facts. Name: Helium. Atomic Number: 2. Element Symbol: He.
