(1)由位置可知,As位于第四周期VA族,电子排布中K、L、M、N层电子数分别为2、8、18、5,则As原子的次外层电子数目为18,故答案为:18;(2)NH_3分子含3个N-H键,且N有1对孤对电子,其电子式为,故答案为:;(3)A.H_2S中S为最低价,且受热分解,则H_2S具有强还原性和热不稳定性,故A正确;B.同主族从上...
Jensen et al (2013) IPSASB history and IPSAS adoption Final for EGPA Workshop 19 April 2013 1 来自 ResearchGate 喜欢 0 阅读量: 17 作者: G Jensen 摘要: The International Public Sector Accounting Standards Board's (IPSASB's) dual roles—as a standard setter for public sector entities and as...
(1)由位置可知,As位于第四周期VA族,电子排布中K、L、M、N层电子数分别为2、8、18、5,则As原子的次外层电子数目为18,故答案为:18;(2)NH_3分子含3个N-H键,且N有1对孤对电子,其电子式为,故答案为:;(3)A.H_2S中S为最低价,且受热分解,则H_2S具有强还原性和热不稳定性,故A正确;B.同主族从上...
Quantum chemical modelling of "green" luminescence in ABO perovskites The origin of the intrinsic excitonic ("green") luminescence in ABO 3 perovskites remains a hot topic over the last quarter of a century. We suggest as a ... RI Eglitis,EA Kotomin,G Borstel - The European Physical ...