Question

Why is the atomic mass of many elements not a whole number?

A.
Elements are unstable.

B.
An element may have isotopes with different numbers of neutrons.

C.
The atomic mass includes all the electrons.

D.
Isotopes are always expressed in decimals.

Answer 1

@alicia25 is it (B)?

Answer 2

"Because there are different isotopes of the elements. The atomic weight is the average based on the proportions that they occur in naturally. For example, hydrogen comes with a single proton, a proton + a neutron, and a proton plus two neutrons. The isotopes with the neutrons occur in very small amounts so the average weight is slightly greater than 1." This summarizes it nicely, so it's basically saying it is the answer is B.

Answer 3

yes you are rite

Answer 4

Thank u