推荐回答（1个）
1、所有的引力势能都是负的。
A、外星球来的罗敏欧，要救走地球上的朱丽叶，必须付出代价，付出能量；
B、从井底救出一个失足落井之人，井越深，需要付出的能量就会越多；
C、将一个正电荷附近的电子推到无穷远，需要付出能量；
、、、、、、这些都是“负”性的表示，“负性”的特征。
2、电负性 electronegativity，表示元素原子在分子中对成键电子的吸引能力；
元素电负性数值越大，原子在形成化学键时，对成键电子的吸引力就越强。
因此，要把化学键打断
bond-breaking，需要的能量就越大。
3、亲和性 affinity，
是对同一事情，同一现象，同一原理，进行不同的描述，得到的不同说法。
电负性的说法，站在超然的地位，在评价某个原子核、某个原子实、某个离子、、、
有多大的吸引力，、、、、、
亲和性的说法，设身处地地站在化合以后的角色上说话：
我们怎么怎么亲如一家，怎么怎么血肉相连、、、
我们怎么怎么亲和无间，要破坏须付出什么代价。
即使没有化合，也站在化合后的身份、地位、【趋势】谈论：
（请参看英文解释）
A、In chemical physics and physical chemistry, chemical affinity is the electronic property by which dissimilar chemical species are capable of forming chemical compounds.
B、Chemical affinity can also refer to the tendency of an atom or compound to combine by chemical reaction with atoms or compounds of unlike composition.
C、In modern terms, we relate affinity to the phenomenon whereby certain atoms or molecules have the 【tendency】 to aggregate or bond.
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