There are 2 isotopes of the fictional element Nz: Isotope 51 and Isotope 55. The average atomic mass of the fictional element Nz is 52.21 amu.

What is the percent abundance of Isotope 51?

What is the percent abundance of Isotope 55?

If we had 63 atoms of element Nz (and remember you can't have just half of an atom):

How many of those atoms would likely be Isotope 51?

How many of those atoms would likely be Isotope 55?