In a Nb nucleus, the number of protons, neutrons, and electrons is :

In a Nb nucleus, the number of protons, neutrons, and electrons is
 
  A) 41, 52, 93.
  B) 41, 52, 52.
  C) 41, 52, 41.
  D) 41, 52, 0.
  E) 52, 41, 0.

Question 2

How much energy is released in the reaction 2H + 2H  4He? m(2H) = 2.012102 u, m(4He) = 4.002603 u
 
  A) 20 MeV
  B) 18 MeV
  C) 13 MeV
  D) 12 MeV
  E) 36 MeV

Question 3

The symbol for a certain isotope of radium is Ra. How many nucleons are there in the nucleus of this isotope?
 
  A) 88
  B) 138
  C) 214
  D) 226
  E) 314

Question 4

The symbol for a certain isotope of polonium is Po. How many neutrons are there in the nucleus of this isotope?
 
  A) 84
  B) 130
  C) 214
  D) 298
  E) 314

Question 5

Name the first three isotopes of hydrogen and their nuclide symbols, and indicate which is most common and which is most unstable.
 
  What will be an ideal response?