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In 1911, Rutherford, Marsden and Geiger discovered the dense atomic nucleus by bombarding a thin gold sheet with the alpha particles emitted by radium. From this observation, they concluded that almost all the atomic matter was concentrated in a tiny volume situated at the atome center, the atomic nucleus.
The electron cloud model is the current quantum model of the atom. Up here on the board, you can basically just see how atomic models evolves with more discovery that scientists had to come to the model that Schrodinger came up with, which is the current quantum model of the atom.
Electron Cloud Model/Quantum Mechanics Model of Atom Quantum Mechanics Model of Atom is nowadays being taught as the most “realistic” atomic model that describes atomic mechanisms as how present science presumes they work.
-> Positron is the anti-particle of electron. -> Next, we know that A Proton is something like 1800 times heavier than an Electron. -> We also know that A Neutron is slightly heavier than a Proton. Of course, Neutron also cannot be the answer.
Positrons are emitted in the positive beta decay of proton-rich (neutron-deficient) radioactive nuclei and are formed in pair production, in which the energy of a gamma ray in the field of a nucleus is converted into an electron-positron pair.
Positrons are formed during decay of nuclides that have an excess of protons in their nucleus compared to the number of neutrons. When decaying takes place, these radionuclides emit a positron and a neutrino.
Atoms are made up of a positively charged nucleus surrounded by a cloud of negatively charged electrons. The nucleus is a collection of particles called protons, which are positively charged, and neutrons, which are electrically neutral.