WebJul 1, 2024 · The H and K lines in the deep purple arise from calcium; the pair of yellow-orange D lines from sodium; and the red C line from hydrogen. Oxygen’s spectral lines are difficult to analyze. In his... WebColor: Colorless gas: Electron Configuration: 1s2: Electron Number: 2: Proton Number: 2: Electron Shell: 2: Density: 0.18 g.cm-3 at 20°C: ... but till 2012, most of the helium reserves have been exhausted and now account …

Astronomers still don’t know exactly what the sun is made of

WebHelium has two known stable isotopes – 3 He and 4 He. The abundance of helium-3 and helium-4 corresponds to 0.0002% and 99.9998% respectively. This difference in abundances can be observed in the Earth’s atmosphere, where the ratio of 4 He atoms to 3 He atoms is approximately 1000000:1. Physical Properties of Helium Helium (from Greek: ἥλιος, romanized: helios, lit. 'sun') is a chemical element with the 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. Its boiling point is the lowest among all the elements, and it does not have a … See more Scientific discoveries The first evidence of helium was observed on August 18, 1868, as a bright yellow line with a wavelength of 587.49 nanometers in the spectrum of the chromosphere of the Sun. … See more Helium has a valence of zero and is chemically unreactive under all normal conditions. It is an electrical insulator unless ionized. As with the other noble gases, helium has metastable energy levels that allow it to remain ionized in an electrical discharge … See more While balloons are perhaps the best known use of helium, they are a minor part of all helium use. Helium is used for many purposes that … See more Effects Neutral helium at standard conditions is non-toxic, plays no biological role and is found in trace … See more Atom In quantum mechanics In the perspective of quantum mechanics, helium is the second simplest atom to model, following the hydrogen atom. Helium is composed of two electrons in atomic orbitals surrounding … See more Natural abundance Although it is rare on Earth, helium is the second most abundant element in the known Universe, constituting 23% of its baryonic mass. Only hydrogen is more abundant. The vast majority of helium was formed by See more While chemically inert, helium contamination impairs the operation of microelectromechanical systems (MEMS) such that iPhones may fail. See more greenlee submersible trash pump

What Causes the Aurora Borealis

http://genchem1.chem.okstate.edu/APCHEMSITE/Personal/Subshell%20Activity%20082013%20Ans.pdf WebLiquid helium is a physical state of helium at very low temperatures at standard atmospheric pressures.Liquid helium may show superfluidity.. At standard pressure, the chemical element helium exists in a liquid form … WebNov 8, 2024 · Here are five things you may not have known about helium. Helium is the only element on the planet that is a completely nonrenewable resource. On Earth, helium is generated deep underground... greenlee stainless knock out sets