Question

What subatomic particle(s) has a mass of 1 amu?

Answer 1

~Hello there! ^_^

Your question: What subatomic particle(s) has a mass of 1 AMU?

Your answer: Both proton and electron have the same mass of 1 AMU.

Hope this helps~

Answer 2

Mass of electron is 0.000548597 amu or 9.1into ten rays power minus 31 kg 
for proton 1.0072766 amu or 1.6726ten rays power minus 27 kg 
and it is 1837 time heavier than electron 
for neutrons 1.0086654amu or 1.6749ten rays power minus 27 kg and 1824 times heavier than electron