百度试题 结果1 题目43. Which element has atoms with exactly four valence electrons in its ground state? C(A)Ca (B) Cr (C) Si(D)S 相关知识点: 试题来源: 解析 C 反馈 收藏
Predict the number of valence electrons in its atom View Solution The atomic number of an element X is 17. Predict (a) its valency, (b) whether it is a metal or nonmetal (c ) the nature of the element, (d) the name of the element and ( e) the relative size with respect to ...
The main results of our study are based on the assumption of strong exchange splitting, for which the interaction between electrons with parallel spins dominates. In principle, the correlation-enhanced SOC effect should also be valid under more general circumstances. In moderate spin-splitting case, ...
This keeps the glass anode substrate from being directly attacked by electrons, to thereby prevent decomposition of water and the like contained in a surface of the glass, resulting in oxygen which causes deterioration in emission characteristics of emitter cones being kept from being released from ...
A chemical element is a substance which cannot be decomposed or resolved into simpler substances by ordinary chemical means. Altogether 105 elements are known. Each element consists of one or more atoms with the same number of protons in the nucleus and electrons outside the nucleus. Not all at...
High-energy protons interact with the nucleus of an atom in the same way as neutrons would (via strong interaction). Low-energy protons behave differently and have a much higher probability of interacting with electrons (via Coulomb interaction). Proton beams may, however, produce less accurate ...
2 valence electrons Metallic solids, harder than the alkali metals Shiny, lustrous, oxidize easily High thermal and electrical conductivity More dense than the alkali metals Higher melting points than alkali metals Exothermic reaction with water, increasing as you move down the group; beryllium does ...
Here the aluminium ion is being reduced (electrons are added). The aluminium metal then sinks to the bottom and is tapped off. The positive anode oxidizes the oxygen of bauxite, which then reacts with the carbon electrode to form carbon dioxide: 2O2- !’ O2 + 2e- O2 + C !’ CO2 ...
(detection of backscattered electrons in SEM) image ofT. pyriformis30 min after treatment with 0.5 mM GdCl3in 1% PPY medium having several Gd-containing particles with bright appearance (arrow). (c) BSE-SEM image of excreted Gd-containing particles ofT. pyriformis24 h after Gd treatment (0.5 ...
shell. For sodium just has K L and M shells (2 8 1) while calcium has K L M and N (2 8 8 2). 2008-01-18 16:30:26 补充： The nuclear charge of Ca must be greater than Na due to 20 protons attract 2粒 outermost shell electrons paring Na with ...