A proton has a positive charge and an electron a negative charge, but a neutron has neither.
A proton has a positive charge and an electron a negative charge, but a neutron has neither.
质子带正电，电子带负电，而中子既不带正电，也不带负电。
A proton has a positive charge and an electron a negative charge, but a neutron has neither.
质子带正电，电子带负电，而中子既不带正电，也不带负电。