In the context of atomic orbitals, what is meant by the term electron cloud?

In the modern quantum mechanical model of the atom, electrons are best described as which of the following?

In atomic theory, what term best describes the region of space around a nucleus where there is a high probability of finding an electron?

In the context of electronic structure and orbitals, what does the electron cloud model describe?

In atomic theory, what best describes an electron cloud?

In its ground-state electron configuration, how many unpaired electrons are present in a neutral phosphorus atom (atomic number $15$)?

In the electronic structure of atoms, how many distinct orbitals exist in the $5f$ subshell?

In the context of the quantum mechanical model of the atom (orbitals), who stated that an electron’s exact path (position and momentum simultaneously) cannot be predicted with certainty?