Question

the current atomic model has a
o clear and exact placement for every electron around the nucleus of an atom
o clear and distinct border surrounding the nucleus of an atom where electrons are located.
o predicted area surrounding the nucleus where the electron could be located.

Explanation:

In the current quantum - mechanical atomic model, electrons are not in clear and exact positions. Instead, they are in probability clouds or orbitals which are predicted areas around the nucleus where an electron is likely to be found. There are no clear and distinct borders for electrons around the nucleus.

Answer:

predicted area surrounding the nucleus where the electron could be located.