These visible, ordinary matters are composed of protons, neutrons and electrons.

这些可见的普通物质由质子、中子和电子组成。

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Well, with a lot of money, you can cut even the atom into to subatomic particles: protons, neutrons and electrons, but even these little magnets still always have one North and South magnetic pole.

好吧，如果你有很多钱，你甚至可以把原子分成一些亚原子粒子：质子、中子和电子，但即使是这些小磁体，也还是有南北磁极。

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An atom itself is a complete whole, with its electrons, protons and neutrons and other elements.

原子本身是个整体，含电子、质子、中子以及其他组成部分。

《柯林斯英汉双解大词典》

They now know there aren't just three types of particles protons, neutrons and electrons but rather, thousands of them.

WSJ: The Weekend Interview with Michio Kaku: Captain Michio and the World of Tomorrow

What are protons, electrons and neutrons composed of?

FORBES: Back to Basics at the National Science Foundation

The argument that cyberspace is somehow different because it is man made forgets that it is built upon natural wave forms, human emotions, electrons, protons, and neutrons just like the ocean, land, and air.

FORBES: A Domain Like Cyberspace