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 ...
MALE STUDENT: 43 protons?MALE PROFESSOR: That’s right. But they named it technetium to emphasize that it was artificially created — with technology. And people thought that synthesizing this element, making it artificially, was the only way to get it. We still hadn’t found it occurring ...
(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) ...
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...
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 ...
and the structure type can be predicted from a knowledge of the ionic radius. The solubility of these halides in water is generally great. The +3oxidesof actinoids are also isostructural, with the general formula M2O3, in which M is an actinoid element; they form cubic (or hexagonal) cr...
As the current in the circuit is given by i = 1.3 V/1 Ω = 1.3 A, we obtain for the internal resistance Ri = 0.2 V/l.3 A = 0.15 Ω 1.4.5 Voltage and Current Sources Voltage sources in general provide voltages that can vary with time such as sinusoids and square waves, or that...
What is the electron configuration of the element with 27 protons? What atom could have the electron configuration of 1s^2 2s^2 2p^3? Which element or ion has the electron configuration 1 s 2 2 s 2 2 p 6 3 s 2 3 p 6 3 d 10 4 s 2 4 p 5 ? a) B r...
Element 120 is expected to be a typical alkaline-earth element. As with element 119, the ionization energies should be higher than the normal familytrendwould indicate and should make the metallic and ionic radii smaller. These changes should make the chemistry of element 120 similar tocalciumand...