氧原子有轻微的负电荷，而氢原子则带对应的正电荷。
The oxygen atom has a slight negative charge while thehydrogen atoms share a compensating positive charge.
就此而论，它控制由带负电荷的电子与正电荷原子核的形成的原子能级。
As such, it governs-among other things-the energy levels of an atom formed from negatively charged electrons and a positive nucleus.
我们开始于原子。每个原子有一个独特的带正电荷的原子核和一些带负电荷的电子(回忆一下因素周期表)。
We start with atoms — each with a distinctive positively-charged nucleus and a distinctive array of negatively-charged electrons (think periodic table).
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