So I will match them but by words so if necessary you will have to do the number letter pairing.. kool:
protons plus neutron = atomic mass proton number = atomic number detects radiation = Geiger Counter fixed shape = solid neutral charge = neutron positive charge = proton occupies the whole container = gas measures the intensity of radiation = photographic film smallest particle to retain characteristics = atom negative charge = electron
Hope this helps and doesn't leave you with too much work
