radiation
energy that comes from a source in the form of waves/rays that you cannot see
nucleus
center of an atom
half-life
the time it takes for half of a radioactive atom undergo radioactive decay
radioisotope
an element that has an unstable nucleus
radioactive decay
emission of energy as electromagnetic waves or as moving subatomic particles
Ionizing radiation is
considered the most harmful
During a nuclear reaction, unstable nuclei release ____ of energy
lots
During a nuclear reaction, unstable nuclei try and become _____ stable.
More
When is radiation most dangerous
when its ingested
Which ray has the least amount of penetrating power
alpha
Which ray is stopped by lead?
Gamma
40 20Ca --> _____ + 0 -1e
40 21Sc
0 -1e
beta
4 2He
Alpha
1 0n
neutron
What is the half-life of the graph?
~3.4
What percentage was left after 11,400 years?
25%
How much time passed after 5% of the substance was left?
22,800 years
True or False.
As the number of half-lives increase, the total number of atoms that exist decreases.
False. They turn into a different substance but still exist.