Answer: Third Amendment
Explanation: The Third Amendment was the least well known, though by 45% to 42% Americans narrowly know that this is the Amendment which ensures the federal government does not force them to house soldiers.
Answer: It has 8 protons
Explanation: The Atomic Number represents the number of protons in the nucleus of an atom.
Btw you shoulda put this in Science not History but I'm glad I could help none the less :).
It’s 3,4,2,1 is the order