Submitted by Oheligud t3_11pm5bs in askscience
Bag-Weary t1_jbyuv63 wrote
Reply to comment by Oheligud in As they still have a neutral charge, can antineutrons replace neutrons in a regular atom? by Oheligud
A neutron is made of up, down, down quarks, and a proton is made of up, up, down. An antineutron would be antiup, antidown, antidown, and the ups and antiups and the downs and antidowns would annihilate if it was in the same atom as a proton.
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