Observations of static electricity and electrical conductivity revealed that substances conduct electricity under certain conditions, suggesting that atoms possess internal structure.
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Early experiments, such as those involving static electricity and electrical conductivity in different substances, provided indications that atoms are not indivisible.
Scientists faced the challenge of elucidating the structure of atoms and explaining their essential properties
Quantum mechanics introduces the concept of quantized energy levels, wherein electrons occupy specific discrete orbits around the nucleus, preventing their collapse into the nucleus due to energy loss.
The stability of atoms is ensured by the quantized energy levels of electrons, which restrict their motion to discrete orbits without continuous energy loss.