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Niels Henrik David Bohr was born on October 7, 1885 in Denmark’s capital city, Copenhagen. He was the second of three children in a prosperous, upper-class family.Physics especially interested Niels and by the time he was a teenager he was correcting the mistakes in his schools’ textbooks. In addition to his intellectual vigor, he was also unusually strong physically. He didn’t just correct textbooks; he would also ‘correct’ other students, getting into fights at school, which he usually won.his father was an eminent physiologist and was largely responsible for awakening his interest in physics while still at school, his mother came from a family distinguished in the field of education. After matriculation at the Gammelholm Grammar School in 1903, he entered Copenhagen University where he came under the guidance of Professor C. Christiansen, a profoundly original and highly endowed physicist, and took his Master's degree in Physics in 1909 and his Doctor's degree in 1911.Niels Bohr completely transformed our view of the atom and of the world. Realizing that classical physics fails catastrophically when things are atom-sized or smaller, he remodeled the atom so electrons occupied ‘allowed’ orbits around the nucleus while all other orbits were forbidden. In doing so he founded quantum mechanics.
Bohr knew that Rutherford’s picture of the atom disagreed with the laws of classical physics. These held that negatively charged electrons must be pulled into the positively charged nucleus. Even when he wrote his Ph.D. thesis, Bohr had stated that it was impossible for classical physics to explain behavior at the atomic scale.Bohr found that electrons are restricted to particular circular orbits, but can jump from a lower energy orbit to a higher energy orbit by absorbing light. They can also do the opposite and fall from a higher energy orbit to a lower energy orbit by emitting light
he explained much of the periodic table’s structure and founded a new scientific discipline – quantum chemistry his theory made a great change in science because from there on people all over the world correct their mind over the atoms theory because, they used to think electrons didn't exist they only were inform of protons and neutrons.
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