9. Elementary Particle Crossword. Work in groups.

Across

1. Fundamental particles are classified according to their ______ .

2. An electrical condition which comes as positive or negative.

3. Attractive or repulsive force between electrically charged objects.

4. Fundamental particles with mass.

5. Proposed carrier of the weakest force.

6. The current best description of elementary particles and their interactions.

7. The effect on a particle due to the presence of other particles.

8. Property of a particle due to an apparent tiny magnetic moment and angular momentum.

9. One of the two quarks comprising stable baryonic matter.

10. A particle comprised of three quarks.

11. A particle which is a twin of another except possessing an opposite charge is referred to as _____ .

12. A neutral lepton which very rarely interacts with matter.

• Down

1. The weakest force in the universe.

2. A particle exchanged between two other particles to transmit a force.

3. The negative charged lepton which in part comprises stable matter.

4. Color neutral particles comprised of three quarks.

5. The carrier of the strong force.

6. A neutral, massless bosonic particle.

7. Responsible for the decay of massive quarks and leptons into lighter quarks and leptons.

8. A quark with –1/3 charge.

9. A quark with +2/3 charge.

10. Transmitters of the four forces are examples of these particles.

11. The most massive quark with –1/3 charge.

12. The most massive quark with a +2/3 charge.

13. The force which holds quarks together.

14. A fermion which possess electric and color charge.

15. A type of charge which comes in three forms.

16. A charged lepton which does not comprise stable matter.

17. A hadronic particle comprised of a quark and antiquark.

18. A fundamental particle with mass which can have electrical but not color charge.

19. The most massive lepton

20. A color neutral particle composed of either two or three quarks.