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proton
The number of
nucleons in the
nucleus
Isotopes
A substance that
cannot be broken
down into a
simpler
substance
Neutron number,
N
The force that
binds neutrons
and protons
together in the
nucleus
Electron
Any particle
found in the
nucleus
Nucleus
Atoms of the
same element
having a different
number of
neutrons
Element
A neutral particle
found in the
nucleus
Neutron
The number of
neutrons in the
nucleus
Strong nuclear
force
The number of
protons in the
nucleus
A particle with a
negative charge
Atomic number, Z
which orbits the
nucleus
nucleon
An object which
produces a
daughter nucleus
by emitting
radiation
Mass number, A
the centre of an
atom containing
virtually all the
mass of the atom
Parent nucleus
A high speed
electron emitted
by a nucleus
Beta (β) particle
Radioactive
Decay
Gamma ray
4
The number of
particles emitted
per second
Activity, A
The units of
Activity
The average time
taken for half the
nuclei in a
sample to decay
Half-life
A Helium nucleus
emitted by a
radioactive
substance
E = ∆mc
formula to work
out the energy
released in a
nuclear reaction
The mass number
of a beta particle
2
The atomic
number of a beta
particle
-1
The atomic
number of an
alpha particle
Becquerels (Bq)
The process of
nuclei breaking
up and emitting
particles or
waves to become
stable
Alpha (α) particle
A short
wavelength
electromagnetic
wave emitted by
a radioactive
nucleus.
0
The mass number
of an alpha
particle
2
A particle with a
positive charge
found in the
nucleus