The electron configuration of a certain element is 1s² 2s² 2p⁴. Which of the following is correct about this element? A. It is a metal. B. It is a non-metal. C. It is a noble gas. D. It is a transition metal. 相关知识点: 试题来源: 解析 B。解析:该元素价电子数为...
Which of the following categories includes two-thirds of all elements? a. metalloids b. metals c. liquids d. nonmetals Types of Elements in the Periodic Table: The periodic table is an arrangement of elements into various horizontal rows called ...
【单选题】How large is the magnetic field generated by the electron in the ground state of a hydrogen atom, at the position of the proton if it would circulate according to Bohr model on the shell n = 1? ( )
Generally, elements with very negative electron affinities gain electrons easily to form negative ions. Which group of elements tends to form anions most easily? Which of the following ions would you expect to be paramagnetic? a) O2+ b) N2^2...
The photoelectron device which uses the material which possesses the electron transition which improvesAn optoelectronic device that includes a material having enhanced electronic transitions. The electronic transitions are enhanced by mixing electronic states at an interface. The interface may be formed by...
E) transition metals 15. Ethene has a molecular shape that is . A)linear B) planar C) tetrahedral D)hexagonal E) cyclic 16. Natural gas consists of short-chain . A)alkynes B) alkenes C) alkanes D)rings E) benzenes 17. Which of the ...
空间中分布着非均匀静电场，电场强度大小的变化规律为E=kx(其中k=60 N/C·m)，方向垂直纸面向外. 电场中有一边长为a=0.1m的正方形线框，位置如图所示. 则通过线框的电场强度通量为( ). (提示:如何切分dS使计算最简便?)
However, all of the reported rotational Doppler dimensions based on VBs can just only be recognized under perfect experimental conditions. The long-range detection is still a challenge. The detection distance considering rotational Doppler effect (RDE) is principally tied to the scattered sign’s sign...
in view of a sharp rise in the amount of adopted kiddies with PHIV since that year. We compared the proportion with virologic suppression and CD4+T-cell count over time involving the following sets of kiddies with PHIV adopted and created outside NL, non-adopted born in NL, and non-adop...
product thought to be associated with tumorigenesis. But, the root system of observed FA effects has not been demonstrably defined. Paxillin is a focal adhesion necessary protein that may play an important role in lot of signaling pathways. Numerous paxillin-interacting proteins take part in the ...