- Created by: Thomas VP
- Created on: 19-10-18 13:41
He = alpha particle (2 neutrons and 2 protons) (a helium nucleus)
219 215 4 (219-4=215)
radon = polonium + He
86 84 2 (86-2=84)
- alpha decay causes the mass and the charge to decrease, as 2 protons and 2 neutrons are released.
- alpha particles are strongly ionisiong but not very penetrating
e = beta particle (high speed electron ejected from the nucleus as a neutron turns into a proton)
14 14 0 (14-0=14)
carbon = nitrogen + e
6 7 -1 (6--1=6+1=7)
- does not cause the mass of the nucleus to change
- causes the charge of the nucleus to increase, as a proton becomes a neuron
- moderately ionising, moderately penetrating
the emission of gamma ray does not change the mass or charge.
atoms and isotopes
4 = mass number (total number of protons and neutrons)
2 = atomic number (number of protons)
number of electrons= number of protons
- if an atom loses or gains electrons, it is IONISED.
- atoms of the same element= have the same number of protons but different number of neutrons.
eg. 14 15 13
N N N
7 7 7
- ATOMS ARE POSITIVE IONS WHEN ELECTRONS ARE LOST
- ATOMS ARE NEGATIVE IONS WHEN ELECTRONS ARE GAINED