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The electron cloud is ​the region of negative charge surrounding an atomic nucleus that is associated with an atomic orbital. The region is defined mathematically, describing a region with a high probability of containing electrons.

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Bohr's theory states that the electron's (negatively charged particles) orbit around the nucleus is like a planets orbit. It is basically a modified version of RutherFord's model but with specific shape/orbit. It is usually described per orbit line namely x, 2x and 3x which compares the particles' energy and how much it is attached to the nucleus.

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He proposed that electrons (negatively charged particles) were floating within a positive sphere. It is said that an atom looked like a plum pudding. He used the Cathode Ray Tube as his basis as it was supported by the Law of Charges.

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Rutherford's model shows that an atom is mostly an empty space with electrons orbiting a positively charged nucleus