After Bohr's discovery. In the 1900's.
i have no idea when it was discovered
an atom
Rutherford.
he discovered it in 1937
Nobody "invented" the electron cloud. The concept was discovered by Werner Heisenberg in 1926.
The concept of the electron cloud was developed by Erwin Schrödinger in 1926 as part of his wave mechanics theory. Schrödinger's work built upon previous discoveries in quantum theory made by scientists such as Max Planck, Albert Einstein, and Niels Bohr.
The Electron Cloud theory was proposed in the early 20th century, around the 1920s. It was developed as an improvement to the Bohr model of the atom to better describe the behavior of electrons within an atom.
in 1809 by neils Rutherford
The dust cloud theory, which suggests that the solar system formed from a rotating disk of gas and dust, was proposed by Russian astrophysicist Viktor Safronov in the 1960s. He published his ideas in his book "Evolution of the Protoplanetary Cloud and Formation of the Earth and Planets."
The electron cloud theory was developed in the late 1930s and early 1940s.
In modern quantum-based atomic theory, the space around the nucleus in which an electron moves is known as an electron cloud or orbital. This is a region of space where there is a high probability of finding the electron. The electron cloud is described by the probability density function of the electron's position in the atom.
An electron cloud is an atomic orbital.