nucleus questions

Question

true or false      The strong nuclear force cause protons and neutrons to be attached to each other.  I say this

                            answer is true.

 

true or false      To have the potential to be readioactive, a nucleus must always be very large.  I think this

                           is true.

 

 

1.  a radioactive nucleus with an atomic mass of 226 emits an alpha particle, what will be the atomic mass of the new nucleus?

 

a.  226

b. 227

c.  224

d. 222                  I think the answer is 226

 

 

2.  if a newutron strikes a heavy nucleus

 

a.  it may deform and stretch the nucleus

b.  the repulsive electrical forces may become much weaker than the strong nuclear force

c.  fusion may occur

d.  all of these

 

 

thanks

 

Answer 1

The two T-F I also say are true.

The strong force causes all the nuclear particles to be attracted to each other.

Only large atoms are radioactive.  The nucleus needs to be so large that the particles on the outside are weakly held by the strong force and can break away more easily.

 

#1) you have wrong.

An alpha particle is the same as a helium nucleus - 2 protons and 2 neutrons.

So if an alpha particle were emitted from any atom its atomic mass will decrease by 4, 2 protons and 2 neutrons.

#1 should be (d) 222

 

#2) sorry I don't know offhand.