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ryansampey21
Aelectron cloud
 
the others being bcd are wrong because b is the center of a atom where the protons and neutrons are c because air does notexist at that scale and d is just the different types of a atom
syed514

Electrons move about the nucleus of an atom in regions called Electron clouds. 
This term is used to describe where electrons are when when they go around the nuclear of an atom.

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