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A guy walks into a bar, and sits down next to an electron.
有一個人走進了酒吧，剛剛好坐在了電子的旁邊。
The electron has two empty beers in front of him, and was working on a third.
電子面前已經(jīng)擺了兩個空啤酒瓶子了，正在與他的第三瓶奮戰(zhàn)著。
My life is a worst, says electron.
我的生活真的很糟糕電子說道，
I just got fired from my job, my dog bit me, my wife left with another guy.
我剛剛被公司辭退了，我的狗要咬我，老婆也和別的男人跑了！
The guy says, Why are you so negative?
這個人問道:你為什么這么負面呢？
OK, now the explanation.
OK，現(xiàn)在來解釋一下。
The nucleus of an atom is composed of neutrons and protons.
原子核由中子和質(zhì)子兩種微粒構(gòu)成。
Around this nucleus swirls a cloud of electrons.
在原子核外部，電子云圍繞原子核旋轉(zhuǎn)。
Why are theelectrons there?
為什么這里會有電子呢？
They are attracted and held in place by an electromagnetic interaction with the nucleus.
電子通過與原子核的電磁相互作用，被吸引到了這里。
The nucleus has a net positive charge, while electrons carry a negative charge.
原子核帶正電荷，而電子則帶負電荷。
And opposite charges attract.
而我們知道，異性相吸。
I get it! Why so negative? He's talking to an electron.
我懂了。誰叫你帶負電呢？他對電子說的話應(yīng)該是這樣理解的吧。
Right!So electrons have a negative charge,while protons, neutrons and nucleus have a positive charge?
是的。那么，也就是說電子是帶負電荷，而質(zhì)子、中子和原子核都是帶正電荷？
Almost! The protons have the positive charge, while the neutrons, as their name suggests, have no charge at all.
這樣說也差不多！質(zhì)子是帶正電荷的，而中子就像他的命名所暗示的一樣，是不帶電的。
If you have three protons in the nucleus, you'll need three electrons to make what's called a stable atom.
如果一個原子核中有三個質(zhì)子，那么必須要有三個電子，這個原子才能夠稱得上是穩(wěn)定的原子。
