Atoms containing the same number of protons and different numbers of neutrons are what

Atoms with the same number of protons and different numbers of neutrons are called isotopes.The isotopes have nearly identical chemical behaviour but they have different atomic masses and physical properties.  Because the isotopes of an element have different numbers of neutrons they have different masses.

all cities have a governor

all cities are in states or provnies then country

all cities have people

difference

some are rich

some are poor

some are average