1.(Elements & Compounds) any of the 118 known substances (of which 93 occur naturally) that consist of atoms with the same number of protons in their nuclei. Comparecompound11 2.one of the fundamental or irreducible components making up a whole ...
(biochemistry) A substance that cannot be decomposed into simpler substances by chemical means, and is made up of atoms all with an identical number of protons (general) A fundamental component of a composite entity (such as asieve elementthat makes up thephloemsinangiosperms) ...
Density functional theory Muons Neutrons Nuclear interactions Protons 被引量: 7 摘要: The semi-microscopic potential between heavy nuclei is evaluated for various colliding ions in the approach of frozen densities in the framework of the extended Thomas-Fermi approximation with hbar^2 correction terms ...
1. any of the 118 known substances (of which 93 occur naturally) that consist of atoms with the same number of protons in their nuclei 2. the most favourable environment for an animal or plant 3. the resistance wire and its former that constitute the electrical heater in a cooker, hea...
We present a simple method for the quantitative analysis of light elements, H, C, N and O, in thin, self-supporting low Z films with MeV protons in one run. Proton-proton scattering is utilized for the detection of hydrogen and backscattered protons are simultaneously analyzed for detecting ...
reaction that produces the huge amounts of energy radiated by the Sun and most other stars is the fusion of the lightest element, hydrogen, its nucleus having a single proton, into helium, the second lightest and second most abundant, with a nucleus consisting of two protons and two neutrons...
aThe element X has three isotopes: X-221, X-220, and X-218, with masses 220.9, 220.0, and 218.1 amu. The relative abundances of these three isotopes are 74.22%, 12.78%, and 13.00%, respectively. Calculate the atomic mass of element X. 元素x有三同位素: X-221, X-220和X-218,与大量...
(II) in the presence of the fluorideionhas been obtained. Divalent actinoids (that is, actinoids in the +2 oxidation state) form compounds with nearly the same properties as those of the divalent lanthanoids and, accordingly, iodides, bromides, and chlorides of divalent americium and ...
An element is an example of an atom with a fixed number of positive protons within the nucleus. For example, sodium is an element with 11 protons within the nucleus and 11 electrons. Another example of an element is carbon, which has six protons within the nucleus and six electrons. In ...
An element is an example of an atom with a fixed number of positive protons within the nucleus. For example, sodium is an element with 11 protons within the nucleus and 11 electrons. Another example of an element is carbon, which has six protons within the nucleus and six electrons. In ...