radioactivity Flashcards
1
Q
number of protons is…
A
atomic/proton number
2
Q
number if protons+neutrons is…
A
mass number
3
Q
mass of nucleus is…
A
relative atomic mass
4
Q
unit for radioactive activity
A
becquerel (Bq)
5
Q
what is alpha made up of
A
2 protons and 2 neutrons
6
Q
what stops alpha decay
A
a FEW cm of air or piece of paper
7
Q
how ionising is alpha
A
highly ionising
8
Q
what is beta made up of
A
an electron - emitted after a neutron turns into a proton
9
Q
what stops beta decay
A
a few mm of aluminium
10
Q
how ionising are beta particles
A
weakly ionising
11
Q
what is a gamma ray
A
high energy EM wave
12
Q
what stops gamma decay
A
a few cm of lead
13
Q
how ionsing are gamma rays
A
very weakly ionising
14
Q
what effect does alpha have
A
lowers mass by 4
lowers atomic number by 2
15
Q
what effect does beta have
A
increases atomic number by one
