proton

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So we get at the number of neutrons indirectly because we know the proton number here.
所以，我们可以间接得到中子数,因为我们知道质子数了。
When a neutron inside an atom decays, it produces a proton, an electron, and a neutrino.
原子内的一个中子衰变后会产生一个质子、一个电子和一个中微子。
Only then can they hope to describe conditions at the big bang, when all space and time was compressed into a volume far smaller than a proton.
只有这样他们才能指望描述一点大爆炸的那个情况，所有的空间和时间全部在那时被压缩成一个小于质子的体积。

This means you can vary the neutron number without changing chemical identity, because chemical identity is fixed by the proton.
这表示你可以改变中子数,而不会改变它的化学特性，因为化学特性是由质子决定的。
麻省理工公开课 - 固态化学导论课程节选
But you can also look at it qualitatively, so, if you think about the force between the electron and the proton, you could just qualitatively think about what's happening.
但你也可以定性的来研究这个问题，所以如果你们考虑电子,和质子之间的作用力,你可以定性的来想。
麻省理工公开课 - 化学原理课程节选
If a proton which has no mass can behave as a particle does it follow that an electron which has mass can behave as a wave?
如果一个没质量的光子能像粒子一样,具有质量的电子能否,表现得像波一样吗？
麻省理工公开课 - 固态化学导论课程节选

Two European banks failures over the weekend: Proton in Greece and Dexia in France and Belgium.
FORBES: Dexia and Proton: the First of the Coming Wave of European Bank Failures

a type of elementary particle (= a very small piece of matter) with a positive electrical charge that is found in the nucleus of all atoms