AP Chemistry will cover not only the expanded octet (up to 18 valence electrons), but also the formal charge method (to make the formal charge of the central atom as close to 0 as possible). However, in IB Chemistry, the formal charge method will not be used. So for the same compound, the Lewis dot structure in the US and the Lewis dot structure in the UK may look different. Is the formal charge method always the better way to go? The answer is no. Based on my knowledge, for some compounds, the observed structure (via X-ray, NMR, cryo-EM, etc) is somewhere between the US version and the UK version, that is, resonance structure.
问题：最外层应该是8个，为啥👆ClF3 中Cl 周围有10e? 例如：CO2 C最外层4个电子分别和2个氧形成2对共价键，共计4对共用电子=8e
天啊
好难啊
美国的化学太难太难了
中国高中生是不学这些的，这是大学基础化学的一部分。lz的孩子应该上的是ap课吧。普通高中不会到这里。或者大学一年级的学生应该都要求选general chemistry
hypervalent molecule
化学其实不难，规则而已，尤其是高中的化学，很多美国高中孩子没有这个耐心
楼上说得对，C和Cl不一样，Cl有d轨道，C没有。
应该是基础化学
所以这还不是AP吗？
按照日前顺序是在基础化学开始的第6次课
为啥这么问？
This is Honor's Chemistry in the US.
AP Chemistry will cover not only the expanded octet (up to 18 valence electrons), but also the formal charge method (to make the formal charge of the central atom as close to 0 as possible).
However, in IB Chemistry, the formal charge method will not be used. So for the same compound, the Lewis dot structure in the US and the Lewis dot structure in the UK may look different.
Is the formal charge method always the better way to go? The answer is no. Based on my knowledge, for some compounds, the observed structure (via X-ray, NMR, cryo-EM, etc) is somewhere between the US version and the UK version, that is, resonance structure.