4.0 Isotopes Flashcards
1
Q
Define Isotope
A
A variation in number of neutrons
2
Q
Do chemical properties change?
A
no
3
Q
Can any properties change?
A
Yes, the mass/colour/density etc can change
4
Q
Stable isotopes are
A
not radioactive
- repulisve/attractive forces in nucleaus are balenced
5
Q
Unstable isotopes are
A
radioactive
- atrractive froce (strong nuclear force) is stronger than the repulsive (electrostatic repulsion)
- or the opposite
6
Q
List the types of radiation
A
Gamma
Alpha
Beta
7
Q
How long are radioisotopes (radioactive isotopes) emitting energy for
A
until they are stable
8
Q
What does alpha radiation emit
A
- ejects up to 4 alpha particles
- lose 2 protons/neutrons (same as the neucleus of a Hydrogen atom)
9
Q
What does beta radiation emit
A
- emits 1 electron and 1 antineutron (neutron changes to proton)
-or emits 1 positron and neutrino
(proton changes to neutron)
10
Q
What does gamma radiation emit
A
just energy no mass
11
Q
What is a half life?
A
the time it takes for a sample of n element to nuclear decay half its original value
12
Q
A
