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The charges are inverted, so anti-protons are actively attracted to protons.

It would immediately explode.

I think OP is proposing a lump of antimatter with no net electric charge.

My guess is that even in this case the lump’s positrons would immediately interact with the table’s electrons and explode.

Even without charge attraction, say anti-neutrons (I don’t know the term) would instantly resolve because neutrons are everywhere.

Free neutorns are everywhere? Why? I think they live only about 10 minutes outside of nuclei.

Still, I don’t think they need to be free. The antimatter will just react with the ones in the nuclei. I don’t know much about any of this but it seems likely.

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