美国和欧洲也扮演了关键角色。
要确保具备所有的关键角色。
2011年,政客们将再次扮演关键角色。
If these bonds were all completely of equal distance apart, whether is was a lone pair or bonding electrons, 5° the angles would be 109 . 5 degrees.
如果不管它是孤对,还是成键,它们等距分开的话,键角是109。
But because there's this lone pair here, it's pushing down on the other bonds, 5° so we end up with an angle of less than 109 . 5 degrees.
但因为这里有孤对,它会把其它键向下压,所以键角会小于109。
They want to get as far away from each other possible, the ideal angle is 120. But what we have here is a four-membered ring, so what angle does 90° that have to be, that bond? 90 degrees.
它们想要尽量远离彼此,最理想的是形成120°键角,但现在是个四元环,所以这键角应该多大?
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