Anuclear particle that has about the same mass as a proton, but with no electrical charge, is called a(n)
a. nuclide.
c. electron.
b. neutron.
d. isotope.

What was one step that charlemagne took to unite his kingdom? a. he chose a single strong heir to inherit his throne. b. he drove muslim forces out of europe. c. he created and supported schools. d. he declared himself head of the catholic church.