Question

1.write the two Bohr's postulates of about the model of an atom?
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Answer 1

Explanation:

1 The negative electron moves around the positive nucleus (proton) in a circular orbit. All electron orbits are centered at the nucleus. Not all classically possible orbits are available to an electron bound to the nucleus.

2 The allowed electron orbits satisfy the first quantization condition: In the nth orbit, the angular momentum {L}_{n} of the electron can take only discrete values:

{L}_{n}=n\hslash ,\phantom{\rule{0.2em}{0ex}}\text{where}\phantom{\rule{0.2em}{0ex}}n=1,2,3,...

Answer 2

THE MAIN POSTULATES OF BOHR'S ATOMIC THEORY ARE:

1. The electrons revolving around the nucleus are confined to certain fixed orbits called shells or energy levels ,each of which is associated with a fixed amount of energy.

2. While it is revolving around the nucleus in an orbit, an electron neither loses not gains energy.

3. An electron revolving in a particular orbit, in gaining a certain amount of energy, jumps to the next orbit and vice versa. Since each orbit is associated with a fixed amount of energy, Bohr called it an energy level.