Match these items.
protons plus neutrons
atomic number
proton
2. proton number
3. neutral charge
electron
4. positive charge
atomic mass
5. smallest particle to retain characteristics
neutron
6. negative charge
atom
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Explanation:

Atomic mass is the sum of number of neutrons and protons present in an element.

Hence, the correct answer is atomic number

Atomic number is defined as the number of protons or electrons present in an element.

Hence, the correct answer is atomic number.

Photographic film is used as an imaging detector and thus detects the radiation.

Hence, the correct answer is photographic film.

Solid state is defined as the state which have fixed shape and volume.

Hence, the correct answer is solid.

Neutrons are a subatomic particle which is present in the nucleus and does not carry any charge.

Hence, the correct answer is neutron.

Protons are a subatomic particle which is present in the nucleus and carry positive charge.

Hence, the correct answer is proton.

Gaseous state is defined as the state which does not have any fixed shape or volume. It occupies the shape of the container.

Hence, the correct answer is gas

Geiger counter is defined as an instrument that is used for detecting and measuring the ionization radiation.

Hence, the correct answer is Geiger counter,

Atom is defined as the smallest unit of matter which cannot be further broken down and thus retain its properties.

Hence, the correct answer is Atom.

Electrons are a subatomic particle which are located around the nucleus in orbits and carry negative charge.

Hence, the correct answer is electron.