Which two particles each have a mass approximately equal to one atomic mass unit?

Regents Chemistry Exam August 2024 Question 1

1 Which two particles each have a mass approximately equal to one atomic mass unit?

(1) positron and electron

(2) positron and neutron

(3) proton and electron

(4) proton and neutron

Solution:

Protons and neutrons have the same mass approximately equal to one atomic unit. Choice 4 is correct.

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