The smallest unit that retains the properties of an element is a(n) -
neutron
molecule
proton
electron
compound

Proton

Explanation:

I'm not 100% sure, but like 70% sure. Because as soon as you remove or add protons, the properties change completely as it becomes a different element.

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answer: i don't know

explanation:

you need to provide a picture, otherwise i can't tell you.

if you can provide one, i'd be more than happy to you with this!