proton

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So we get at the number of neutrons indirectly because we know the proton number here.
所以，我們可以間接得到中子數,因爲我們知道質子數了。
When a neutron inside an atom decays, it produces a proton, an electron, and a neutrino.
原子內的一個中子衰變後會産生一個質子、一個電子和一個中微子。
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.
衹有這樣他們才能指望描述一點大爆炸的那個情況，所有的空間和時間全部在那時被壓縮成一個小於質子的躰積。

This means you can vary the neutron number without changing chemical identity, because chemical identity is fixed by the proton.
這表示你可以改變中子數,而不會改變它的化學特性，因爲化學特性是由質子決定的。
麻省理工公開課 - 固態化學導論課程節選
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.
但你也可以定性的來研究這個問題，所以如果你們考慮電子,和質子之間的作用力,你可以定性的來想。
麻省理工公開課 - 化學原理課程節選
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?
如果一個沒質量的光子能像粒子一樣,具有質量的電子能否,表現得像波一樣嗎？
麻省理工公開課 - 固態化學導論課程節選

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