Question 22M.2.SL.TZ1.1f
| Date | May 2022 | Marks available | [Maximum mark: 2] | Reference code | 22M.2.SL.TZ1.1f |
| Level | SL | Paper | 2 | Time zone | TZ1 |
| Command term | Suggest | Question number | f | Adapted from | N/A |
Suggest two reasons why atoms are no longer regarded as the indivisible units of matter.
[2]
Any two of:
subatomic particles «discovered»
OR
particles smaller/with masses less than atoms «discovered»
OR
«existence of» isotopes «same number of protons, different number of neutrons» ✔
charged particles obtained from «neutral» atoms
OR
atoms can gain or lose electrons «and become charged» ✔
atom «discovered» to have structure ✔
fission
OR
atoms can be split ✔
Accept atoms can undergo fusion «to produce heavier atoms»
Accept specific examples of particles.
Award [2] for “atom shown to have a nucleus with electrons around it” as both M1 and M3.
The question was marked quite leniently so that the majority of candidates gained at least one of the marks by mentioning a subatomic particle. A significant number read "indivisible" as "invisible" however.
