4，F[-] >H[-]是因为F[-] 比H[-]多一层电子。
Hi guys...im Frank,thank god my friend told me about this site,u people are my only hope now.Here is a question from my chem homeworkI am trying to rank the size of atoms and ions for the following elements:Be[2+]F[-]Li[+]Cl[-]H[-]I tried to compare their atomic radius,but...
The electron-pair intracule (relative motion)h(u)and extracule (center-of-mass motion)d(R)densities represent probability densities for the interelectronic distance and the center-of-mass radius of any pairs of electrons, respectively. For 102 atoms from He (atomic numberZ=2)to Lr(Z=103),...
atoms-- sizeberyllium ions-- sizehelium-- sizeelectronic structurespinNo abstract available.doi:10.1038/250566a0BOYDRUSSELL JNatureBoyd RJ (1974). Nature 250: 566R.J. Boyd, Relative sizes of high and low spin states of atoms, Nature 250 (1974) 566-567....
It is postulated that the effective atomic charges on the atoms in normal valence compounds depend on the relative (covalent) sizes of the atoms, as well as on the electronegativity difference of the component atoms. Examples of evidence supporting this postulate are taken from crystal structure,...
Relative atomic mass is a dimensionless physical quantity, the ratio of the average mass of atoms of an element (from a single given sample or source) to12of the mass of an atom of carbon-12 (known as the unified atomic mass unit). ...
The problem: Find the relative numbers of hydrogen atoms in the chromosphere (T=5000 K) in the n=1, 2, 3, and 4 energy levels. Solution: The Boltzmann distribution of energies is n(ε)dε=\frac{2πN}{(πkT)^{3/2}}\sqrt{ε}e^{-ε/kT}dε So using this I calculated the ra...
Give three reasons why carbon is preferred over hydrogen in the relative atomic mass of an atom. Why are large atoms more polarizable? Explain why the exact size of an atom is difficult to determine. Consider the elements: He, Ne, and Ar. Can you come up with a reason why they are...
美 英 un.相对速率 网络相对角速率 英汉 网络释义 un. 1. 相对速率 例句
美 英 un.相对数 网络黑子相对数;相对数字 英汉 网络释义 un. 1. 相对数 例句 更多例句筛选