Unstable isotopes try to become more stable by giving out particles from the nucleus via radiation
3 different types
Alpha
Beta
Gamma
Alpha Decay Loses 2 Neutrons and 2 protons and therefore Atomic mass loses 4 as the proton and neutron both hold mass (Example not realistic:)
4238
Na ---> Na
1210
Beta decay loses one electron so mass number doesn't change it would look like this. Because its losing an electron not proton the number actually goes up (Yet again not realistic) Show it like this
42 42 0
Na ----> Na + B
12 13 -1
Alpha radiation is the most ionizing and therefore most deadly but has the shortest distance of travel. Alpha radiation can be stopped by paper
Beta radiation is in the middle for ionizing power and is the second most penetrating. Cannot get through tin foil
Gamma rays are stopped by lead and are the least ionizing but considering their high power to get through things they are probably the most dangerous as your most likely to have constant interaction with this radiation