Niels Bohr?

Question

Why was it necessary for Bohr to require that electrons remain in stationary orbits?

Answer 1

Bohr was a genius in his own rights. First of all let us all get it right. There is nothing called an atom or an electron! Its all models. We get some observations, and we try to fit some model into it. Atomic model fits a lot of observations. That's all. I again reiterate, its just a model! But ITS AN ELEGANT MODEL.
During the time of Bohr, it was discovered that some experiments can be explained by assuming point negative charges named "electron" in a bigger mass named "atom", which also has a heavy positive part named "nucleus". To make the positive and negative parts co-exist and be stable (because naturally they will attract each other and merge), Bohr gave this elegant model of positive core with revolving electrons. The revolution generate a repelling force which gets nullified by the attractive force towards the nucleus. This makes the whole model stable.

Answer 2

It was just easier to visualize. Bohr knew his hypothesis of stationary orbits was wrong, but it was a simple way to think of it and in the field of physics in the 20's, it was groundbreaking. Scientists had no real way to think of the atom until the Rutherford experiment, which proved that there was a positively charged nucleus. When Bohr hypothesized the negative charge orbiting around the positive nucleus, it was enough to win him the Nobel Prize in physics.

Stationary orbits was certainly wrong, but considering our knowledge of the electron cloud today, he wasn't too far off the mark.

Answer 3

Unless i'm don't understand the question, Bohr did not say that. He actually said that electrons can jump to a higher orbit (energy level) to the next if the electron is hit by a photon. And the opposite happens when the electron goes to a lover energy state (a photon is released).

Answer 4

other wise they will gain and loose enegy constantly...

If the orbits of the electrons degraded the electrons would fall in to the neucleus and the atom would fall appart. (this would take only a fraction of a second)
Thus because it did not happen in real life he desided that we must assume that electrons stay in a stationary orbit untill they are stimulated to move.

Answer 5

Charges moving accelerated give radiation according to Maxwell's theory. Electrons in circular orbit move always accelerated.
So electrons should give radiation always and the electron would loose energy by falling to the nucleus. The atom would be instable.

Answer 6

simple it was practically known that some atoms remain stable for very much time voilating rutherfords model so it must be stationary orbit not spiral

Answer 7

I have no idea who he is.