Answer
A) True
B) True
C) False
D) False
Work Step by Step
PART A: This is a true statement because the charge of the proton and the electron are equal in magnitude but opposite in sign, so that when the two particles are paired, the charges sum to zero.
PART B: This is a true statement because both the proton and the neutron have nearly the same mass at 1.67 x 10-27 kg.
PART C: This is a false statement because every element has at least one proton.
PART D: This is a false statement because the proton has a positive charge, whereas a neutron has no charge.
