1) Helium is a monatomic gas.氦是单原子气体2) Helium is a noble gas. 氦气是惰性气体。3) monoatomic gas 单原子气体4) monatomic ideal gas 单原子理想气体 1. After four quantities of the monatomic ideal gas and quantum gas were calculated,the utility of N-E-V distribution will be ...
(3)helium atom:氦原子 例句:The structure of the helium atom is relatively simple. 翻译:氦原子的结构相对简单。 --- 4. 实用片段 (1)“Look, there are so many helium - filled balloons floating in the sky. It must be a big celebration today.” 翻译:“看,天空中有好多充氦气球在飘呢。今...
Compounds: Because a helium atom has a valence of zero, it has extremely low chemical reactivity. However, unstable compounds called excimers can be formed when electricity is applied to the gas. HeH+is stable in its ground state, but it is the strongest known Bronsted acid, capable of prot...
After hydrogen, the atom with the simplest structure is that ofhelium. 在氢元素之后, 氦的原子结构最简单. 辞典例句 Hydrogen might be depleted with some of it turning intohelium. 氢可能被耗尽,一部分变为氦. 辞典例句 The discovery also explains whyheliumis found in radioactive mineral deposits. ...
It is shown that this property holds even for the simplest atomic state of more than one electron, namely the [J.sup.[pi]] = [0.sup.+] ground state of the 2electron Helium atom. The crucial role of multi-configuration states of bound fermions "If light hits the two electrons of a ...
It’s the only known gas with a lower density than hydrogen of 0.000164 g cm−3 (At the atmospheric pressure of 1 atm and 0°C). Helium is monoatomic(single atom) in nature, which means that the number of its electrons matches the number of protons. ...
helium- a very light colorless element that is one of the six inert gasses; the most difficult gas to liquefy; occurs in economically extractable amounts in certain natural gases (as those found in Texas and Kansas) atomic number 2,He ...
a very light nonflammable colourless odourless element that is an inert gas, occurring in certain natural gases: used in balloons and in cryogenic research. Symbol: He; atomic no.: 2; atomic wt.: 4.002602; density: 0.1785 kg/m3; at normal pressures it is liquid down to absolute zero; mel...
Helium atom precision measurements and calculations have a history of nearly a century. In the 1960s, theorists discovered that the fine-structure split (23P0-23P2) of the 23P energy level of helium is the best atomic system for measuring the fine struct
The helium atom is the simplest form of a three-body problem in physics, which cannot be solved exactly in classical or quantum mechanics. It is composed of two protons, two neutrons, and two electrons, and its behavior can be described using the Schrödinger equation. ...