After Bohr's discovery. In the 1900's.
i have no idea when it was discovered
Otto Schmidt created the dust cloud theory
an atom
Rutherford.
he discovered it in 1937
Nobody "invented" the electron cloud. The concept was discovered by Werner Heisenberg in 1926.
in 1809 by neils Rutherford
The electron cloud theory was developed in the late 1930s and early 1940s.
in the energy levels. energy levels are in the electron cloud.
in order to accomodate more electrons in the shell the electron cloud needs to be broadened
in 1926In the early 1900's. See Wikipedia entries for JJ Thomson and Ernest Rutherford.
It was Erwin Schrodinger and Werner Hiesenburg.