16. Radioactive element has 2 isotopes. The relative abundance of one element is 65% with a mass of 29.37. The remainder has an atomic mass of 31.05. Find the average atomic mass of the element.
(Help a girl out pls)

Idont know. if you want an answer you need to give us some context dude.

It is a mixture. simply put, a compound must be pure, that is, of only one chemical structure and composition. a mixture is made of different chemical substances (i.e. elements, molecules, compounds) that are not chemically bonded to each other, but instead physically grouped together, as in the case of gasoline (a homogeneous solution).

Is there a c and d?

The first one is the one that violate the law