One of the features of Dalton's atomic theory no longer considered to be correct is: All atoms of each element are identical in every respect.Which of the following is the best explanation of why this feature is no longer considered valid?
A)The existence of isotopes
B)The existence of ions
C)Natural variation in the mass of the proton
D)Natural variation in the mass of the neutron
E)Natural variation in the masses of the proton and the neutron

Question

Quizplus · Accepted Answer

The existence of isotopes shows that atoms of the same element can have different numbers of neutrons, which means that they have different atomic masses. This contradicts Dalton's theory that all atoms of a given element are identical in every way.

One of the Features of Dalton's Atomic Theory No Longer