Ions (Also seen in GCSE Physics 2)
An atom may gain or lose electrons. When this happens the atoms becomes electrically charged (positively or negatively). We call this an ion.
If the atom gains an electron there are more negative charges than positive, so the atom is a negative ion.
Gaining one electron would mean it has an overall charge of -1, which actually means -1.6 x 10-19C.
Gaining two electrons would mean it has an overall charge of -2, which actually means -3.2 x 10-19C.
If the atom loses an electron there are more positive charges than negative, so the atom is a positive ion.
Losing one electron would mean it has an overall charge of +1, which actually means +1.6 x 10-19C.
Losing two electrons would mean it has an overall charge of +2, which actually means +3.2 x 10-19C.
| Section 2 | Particles and Antiparticles | |
|---|---|---|
| Lesson 2 | ||
| Learning Outcomes | To know what is the difference between particles and antiparticles | |
| To be able to explain what annihilation is | ||
| To be able to explain what pair production is | M.BENYOHAI |