Question

The modern model of the atom describes electrons in a little less specific detail than earlier models did. Why is it that being less sure about the placement of electrons in an atom is actually an improvement over earlier models?

A.Electrons do not follow specific paths, so describing the area where an electron is likely to be is more scientifically accurate.
B.Electrons were thought to be negatively charged, but now scientists know that their charge depends on their energy level.
C.The modern model is based on mathematical equations, so the results become less clear when the decimals are rounded.
D.The position of electrons in atomic models has changed so much that it is better to have a less specific model than to be wrong again.

Answer 1

It is A.
B is false because electrons are always negative.
C is false because you don't round here I guess
D is false because electrons in atomic models' shapes have not changed a lot.

Answer 2

As per Bohr's theory of atomic model, electrons are present in specific orbits where they revolve around the nucleus. The orbits are stationary as the energy of each orbit is fixed and electron will neither emit nor absorb energy as long as they are on the orbit.

But this theory contradicts Heisenberg's uncertainty principle.As per this theory, we can not determine the exact position and momentum of a microscopic particle simultaneously.

Modern orbital theory predicts electron in specific orbitals which are three dimensional in nature. It is a quantum mechanical phenomenon where we can not apply classical mechanics to determine the exact position of electron. The  square of amplitude wave function associated with the electron gives the probability of finding the electron in a particular region.

The charge of electron is always negative.It is a fundamental particle and its charge is the same in every matter.

Hence the correct answer to the question will be A.Electrons do not follow specific paths, so describing the area where an electron is likely to be is more scientifically accurate.