A proton or neutron

(a)  

 Number of nucleons (protons +

neutrons) in nucleus

(a)  

Number of protons in nucleus

(a)  

When an unstable nucleus emits a particle (alpha, beta,

gamma)

(a)  

a. the time taken for ½ the number of radioactive nuclei in sample to decay

b. the time taken for the activity of a sample to decrease to ½ its initial value

(a)  

When a nucleus is bombarded in a laboratory with a

nucleon, an alpha particle or another small nucleus, resulting in a nuclide with a

different proton number (a different element).

(a)  

1/12 th the mass of a carbon-12 nucleus

(a)  

 Difference between the mass of the nucleus and the sum of the

masses of its individual nucleons

(a)  

 Energy released when a nuclide is assembled from its

individual components

(a)  

 Energy released per nucleon when a nuclide is

assembled from its individual components

(a)