Question

(Please help)

1.what is the most common isotope for element x

2.calculate the average atomic mass for element x

Answer 1

1. Isotope with mass number 39.

2. 39.02g/mol

Step-by-step explanation:

1. The most common isotope is the isotope in the higher proportion, that is:

Isotope with mass number 39.

2. The average atomic mass is the sum of the masses times their abundance. For the element X:

Average atomic mass:

38*0.0967 + 39*0.7868 + 40*0.1134 + 41*0.0031

= 39.02g/mol