An electron has a. about the same mass as a proton or a neutron b. no mass at all c. more mass than a proton or a neutron d. far less mass than either a proton or a neutron

d

a proton and neutron weigh about the same, while an electron is about 1/2000 of the weight of either a proton or neutron

the first american roller coaster was the mauch chunk switchback railway, built in the mountains of pennsylvania in the mid-1800s. the track, originally built to send coal to a railway, was reconfigured as a "scenic tour."