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2007-10-02 09:27:50 · 1 answers · asked by kana f 1 in Science & Mathematics Physics

1 answers

Hi. Sub-atomic elements which make up the protons and neutrons in an atom. There are two main types, called "up" and "down". Two of one attached to one of the other makes a particle of normal matter.

2007-10-02 09:32:49 · answer #1 · answered by Cirric 7 · 0 0

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